The Fermi energy is a crucial parameter in solid-state physics that determines the behavior of electrons in metals. It represents the energy required to remove the highest-energy electron from a metal at absolute zero temperature.
The value of the Fermi energy is an indicator of the metal's electronic properties, such as conductivity and thermal properties. It is a fundamental concept that helps us understand various phenomena in condensed matter physics, including semiconductors, superconductors, and magnetism. To calculate the Fermi energy, we can use the formula:E_F = (h^2 / 2m)(3π^2n)^(2/3)
where h is Planck's constant, m is the mass of an electron, and n is the electron density.Plugging in the values, we get:E_F = (6.626E-34 J.s)^2 / 2(9.109E-31 kg)(3π^2(7.2E28 m^-3))^(2/3)
Simplifying this expression gives us:E_F = 28.9 eV
Therefore, the Fermi energy of the metal with an electron density of n = 7.2E28 m3 is 28.9 eV.For such more questions on Fermi energy
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If the hot air balloon is 21 feet off the ground, what is the distance between the ground directly underneath the balloon and the second rope rounded to the nearest hundredth of a foot?.
The distance between the ground directly underneath the balloon and the second rope is 36.37 feet.
The complete question is in the attachment. Look at the triangle ACD. For ∠ ACD = θ the trigonometric ratios
sin θ = y/rcos θ = x/rtan θ = y/xcosec θ = r/ysec θ = r/xcot θ = x/yLook at the picture
Point D is the hot air balloon.Point A is the ground directly underneath the balloon.Point B is the first rope.Point C is the second rope.From the ground directly underneath the balloon to the second rope and hot air balloon form triangle ACD.∠ ACD = θ = 30°AD = 21 feettan θ = y/x
tan 30° = AD/AC
tan 30° = 21/AC
AC = 21 ÷ tan 30°
AC = 21 ÷ 0.577
AC = 36.37 feet
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A train tart from ret ,it move through 1km in 100 with uniform acceleration. What will be it peed at the end of 100
The train velocity (speed) at the end of 100km will be 10m/s.
The train starts from rest and moves through a distance of 1 km in 100 km with a uniform acceleration. The formula for velocity at the end of a certain time period is calculated by the following formula:
where:
v = final velocity (speed)
u = initial velocity (0 m/s, since the train starts from rest)
a = acceleration (0.01 m/s^2)
t = time (100,000 seconds, since the train travels 1 km in 100 km)
v = u + at
v = 0 + (0.01 m/s²)(100,000 s)
v = 10 m/s
It means at and after 100km onward, the train will be moving at a speed of 10m/s. The train's velocity increases linearly with time due to the uniform acceleration, and after 100 km of travel, it reaches a final velocity of 10 m/s.
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Can anyone help me answer this question?
______ is an instrument that measures small electric currents due to changing magnetic fields.
a) Ammeter
b) Galvanometer
c) Voltmeter
d) Dynanometer
A person pushes a lawnmower across 20 meters of grass. If the person pushes with 37 Newtons of force while pushing downward at an angle of 15 degrees below the horizontal, what is the amount of work the person does on the lawnmower?
Therefore, the amount of work done on the lawnmower is: W=Fdcosθ=(37 N)(20 m)cos15∘≈710J if is the amount of work the person.
What is the simple definition of work?Work is force applied over distance. Examples of work include lifting an object against the Earth's gravitation, driving a car up a hill, and pulling down a captive helium balloon. Work is a mechanical manifestation of energy. The standard unit of work is the joule (J), equivalent to a newton - meter.
What is work and energy?Work is defined as transferring energy into an object so that there is some displacement. Energy is defined as the ability to do work. Work done is always the same. Energy can be of different types such as kinetic and potential energy.
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Find , the length of , the sum of and . Express in terms of , , an angle , using radian measure for known angles.
Length of : |AB| = √(x2-x1)2 + (y2-y1)2
|AB| = √(x2-x1)2 + (y2-y1)2
|AB| = √(x2-x1)2 + (y2-y1)2
Sum of : x1+x2+y1+y2
Angle : θ = arctan2(y2-y1, x2-x1)
What is length?Length is a measure of distance in one dimension, typically described as the longest side of an object, such as a line, a road, or a wall. The most common unit of measurement is a linear one, such feet, miles, centimetres, or millimetres. Length can also be measured in three-dimensional units, such as inches, feet, yards, and miles, as well as in other units such as cubits, rods, and fathoms. In terms of physics, length is the physical property of an object that describes its overall size and shape, or the distance between two points.
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When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1600 kg automobile traveling at 42.8 m/s comes to a halt after its brakes are applied, how much can the temperature rise in each of the four 3.5 kg steel brake disks? Assume the disks are made of iron (cp = 448 J/kg·°C) and that all of the kinetic energy is distributed in equal parts to the internal energy of the brakes.
The temperature can rise 234° C in each of the four 3.5 kg steel brake disks.
What is law of conservation of energy?Energy cannot be created or destroyed, according to the law of conservation of energy. However, it is capable of change from one form to another. An isolated system's total energy is constant regardless of the types of energy present.
According to law of conservation of energy:
1/2 × 1600 × 42.8² = 4 × 3.5 × 448 × Δt
Δt = (1600 × 42.8² )/( 2 × 4 × 3.5 × 448)
Δt = 234° C.
Hence, the temperature can rise 234° C in each of the steel brake disks.
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The tape in a videotape cassette has a total
length 213 m and can play for 2.4 h. As the
tape starts to play, the full reel has an outer
radius of 48 mm and an inner radius of 11 mm.
At some point during the play, both reels will
have the same angular speed.
What is this common angular speed?
Answer in units of rad/s.
Both reels will have the same angular speed of 0.0500 rad/sec.
What is angular speed?
angular speed is described as the rate at which an object changes it angles which we measure in radians in a given time
Given data:
The total length of videotape cassette is, L = 213 m.
The time interval for the play is, 2.4 = 2.4 x 3600
The outer radius of tape is, 48mm
The inner radius of tape is, 11mm
The videotape will undergo rotational motion and the value of angular velocity is given as,
w = v/ r ... eqn (1)
Here, v is the linear speed of the cassette and r is the effective radius of the cassette, and its value is,
r =√ R²o + R²i/ 2
r = 49.24mm
And, the linear speed of the cassette is given as
v = L/ t
v = 213/ 8640
v = 0.02465 m/s
Substitute the values in equation (1) as
w = v/r
w = 0.02465/ 49.24
w = 0.0500 rad/sec.
Thus, we can conclude that at some point during the play, both reels will have the same angular speed of 0.0500 rad/sec.
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7. What is the power (in Watts) of the Pokemon Machamp that uses 237 N of force to move a huge boulder 83 m in 5s?
The power in watts of the Pokemon Machamp that uses 237N of force to move a huge boulder 83 m in 5s is 3,934.2Watts.
How to calculate power?Power refers to the measure of the rate of doing work or transferring energy.
The quantity that has to do with the rate at which a certain amount of work is done is known as the power. The power of a substance can be calculated using the following formula;
P = Work done ÷ time
Since work = Force × distance
Power = (Force × distance)/time
Power = (237 × 83)/5
Power = 3,934.2Watts
Therefore, 3,934.2Watts is the power of the Pokémon machamp.
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Describe, using Bernoulli's principle,how roofs are
lifted off
buildings in tornados.
Answer:
Bernoulli's principle explains how objects heavier than air are able to fly
Explanation:
Basically, Bernoulli's principle states that faster-moving air has greater air pressure than slower-moving air
When an object has greater air pressure on its top surface than its lower surface it will create lift, or lift the object up
Thus in a tornado, with extremely high winds a roof could be easily lifted up if the air pressure is greater than the force of gravity
25 bullets about Pierre&Marie Curie,or the creation of the polonium and or Radium
In 1898, the Curies' study of pitchblende led to the discovery of both the substances radium and polonium.
What was the purpose of pitchblende?The original purpose of pitchblende extraction was to create coloring agents for the glassmaking industry. By analyzing pitchblende, the German geologist Klaproth discovered uranium in 1789. A.H. Becquerel made the discovery of radioactivity in 1896. A naturally occurring organic substance is pitchblende. It is the main source of uranium ore, which is present there as uranium oxide, or U3O8. Risks include those brought on by radiation and dust particles.
What about pitchblende was unexpected?Even more astonishingly, Marie discovered that a uranium rock known as pitchblende included two potently radioactive new elements that she dubbed polonium and radium after her native Poland.
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A pulse has a speed of 0,5cm.s-¹. How far does it travel in 2,5s?
The pulse traveled 1.25 cm in 2.5s. with 0.5 cm/s
From the equation of motion in 2 dimensions d = v*t ...... ( i )
As
v= d/t so d=v*twhere the time taken is 2.5 s
the velocity of pulse is 0.5 cm/s
to find the distance covered in a given time which a velocity of 0.5 m/s
so from equation (i)
d= v*t..........................(from i)d = 0.5 * 2.5d= 1.25So the distance it will be covered is 1.25 cm
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What is MLA formatting used for?
MLA style is most commonly used to cite sources within the language arts, cultural studies, and other humanities disciplines.
MLA Style Citation Writing FormatThe Modern Language Association or better known as the MLA style is a citation issued by MLA with a simple design. The aim is to make it easier for writers to write citations. Usually this style is used in the fields of Humanities and English.
the characteristics of MLA Styles' writing are:
The author's name is written in full with the last name written in front The year of publication is put at the end Quotations on the page simply by writing the last word and the page number of the quote On certain media, information on media type and format can be added, for example print or online On online sources, it is enough to display the month and year accessed without mentioning the online source.Learn more about MLA style at https://brainly.com/question/27750517.
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At an equilibrium position of a pendulum, the is at a maximum.
At an equilibrium position of a pendulum, the velocity is at a maximum.
The pendulum hangs straight down while it is at rest, not swinging. This position is called the equilibrium position. It is practical to consider this position to be the origin or reference position indicated in the definition of position.
The pendulum's lowest point is where the equilibrium point is located. It is called this because, there are no forces acting on it. This is the point at which the pendulum would be at a stable, motionless equilibrium.
It is also the time when the pendulum, after being let go from above, totally converts the gravitational potential energy it began with into kinetic energy. As such, this means that at this point the pendulum is at its maximum velocity.
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A ball with a mass of 0.5 kilograms is lifted to a height of 2.0 meters and dropped. It bounces back to a height of 1.8 meters.
The energy of the ball has been reduced by
[ Select ]
(...)0.98 (...)8.82 (...)9.8 joules after bouncing back. This reduction happens because potential energy transforms to
[ Select ]
(...)kinetic (...)light (...)thermal energy.
Hint: Use PE = m × g × h where g = 9.8 m/s2.
The energy of the ball has been reduced by 0.98 joules (option A) after bouncing back because potential energy has been transformed into kinetic energy (option A).
What is potential and kinetic energy?Potential energy is the energy possessed by an object because of its position while kinetic energy is the energy possessed by an object because of its motion.
According to this question, a ball with a mass of 0.5 kg is lifted to a height of 2.0 meters and dropped. It bounces back to a height of 1.8 meters. The difference in potential energy can be calculated as follows:
P.E (1) = 0.5 × 2 × 9.8 = 9.8J
P.E (2) = 0.5 × 1.8 × 9.8 = 8.82J
∆P.E= 9.8 - 8.82 = 0.98J
This reduction occured because the potential energy of the ball changes to kinetic energy (in motion).
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Formula for finding the depth of sea
with explanation
Answer:
d/2=vt
Explanation:
Since the speed of sound in water is known, the simple equation "d/2 = vt" is used to find the depth "d".
An elevator weighing 230000 n is supported by a steel cable. What is the tension in the cable when the elevator accelerates down at a rate of 3. 7 m/s2 rounded to the nearest tenth?.
The required tension in the cable when the elevator accelerates down at a rate of 3. 7 m/s2 is 143163.26 N.
What is acceleration?The rate at which velocity changes is called acceleration. Acceleration typically indicates a change in speed, but not necessarily. An item that follows a circular course while maintaining a constant speed is still moving forward because the direction of its motion is shifting.
According to question:We have,
Weight = 230000N, Mass of elevator = 23469.38 kg
a = 3.7 m/s^2
So, by free body concept
230000 - T = 23469.38 kg(3.7)
230000 - T = 86836.74
T = 143163.26 N
Thus, required tension in string is 143163.26 N.
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people with poor lifestyle habits or known chronic diseases are strongly advised to have a medical screening before starting an exercise program true or false?
This statement is accurate because it is strongly encouraged that those with unhealthy lifestyle choices or known heritable diseases undergo a medical examination before beginning an exercise regimen.
What is Chronic diseases ?Chd, type two diabetes, and other infectious conditions can all be prevented, delayed, and managed with a nutritious diet. Lean protein, whole grains, a variety of fruits and vegetables, low-fat dairy products, and a diet low in sweeteners, animal fats, and sodium make up a balanced, healthy diet.
Your overall health, physical fitness, and life experience can all benefit from regular physical activity. Your risk of developing chronic illnesses like type two diabetes, heart attacks, numerous cancers, anxiety and depression, and brain is also decreased.
What is the best strategy to manage a chronic illness?How can a chronic condition improve my quality of life.
consuming a balanced diet.
Performing as much exercise as you can.
avoiding harmful coping strategies like drinking and drug abuse.
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Question 3 of 10
Brittany learns that her primary care doctor will be switching to electronic
health records. Although she understands that this will improve her care, she
expresses concern to her doctor. What is likely one of her concerns?
A. The risk of her medical information being misused or shared.
B. Lack of personal access to her files.
C. Loss of revenue by her doctor's office.
D. Increased cost of a doctor visit.
SUBMIT
At the time of care, giving patients accurate, complete, and current information. facilitating quick access to patient records to improve coordination and effectiveness of service.
Do you believe switching from paper records to electronic records is beneficial to a health care practice why or why not?EHRs have the potential to be more effective than paper records because they permit centralised chart management and quicker access to patient data from any location with condition-specific inquiries.The term "Electronic Health Record" (EHR) refers to an electronic version of a patient's medical history that is kept on file by the healthcare provider over time. It may contain all of the essential administrative clinical data pertinent to that person's treatment by that provider, such as demographics, progress notes, issues, and medication information.contain information on a patient's medical history, diagnosis, prescriptions, treatment plans, dates of vaccinations, allergies, radiology images, and results of lab and test work.Providers should have access to evidence-based instruments that they may use to decide how to treat a patient.Streamline and automate provider workflow.To learn more about coordination refer to:
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e. Solve the following problem. Water has a specific heat of
4184 J/kg C. How much energy is needed to increase the
temperature of 3 kg of water 15 C ?
Energy needed to increase the temperature of 3 kg of water 15 C is 188280 J.
What is Energy ?In physics, energy refers to a quantitative property that is transferred to a body and can be perceived in the performance of work. Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed. Scientists explain energy as the ability to perform work. Modern civilization is possible because humans have learned to convert energy from one form to another and use it for work. Energy is the ability of the body to do work. I learned about different forms of energy which are Mechanical, Thermal, Chemical, Electrical, Optical, Acoustic, Nuclear, etc. They are interchangeable.However, energy cannot be created or destroyed.To learn more about Energy from the given link :
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Source of error for measuring magnetic fields in a solenoid lab
The source of errors in this experiment could occur from the improper measuring technique. While measuring the magnetic field in the solenoid, the magnetic field sensor might not be held properly perpendicular to the table on which the solenoid was resting.
What are the factors affecting the magnetic field of a solenoid?The factors that can affect the strength of a magnetic field at a point are the magnitude of the electric current and the perpendicular distance between the point and the conductor.
Can solenoids be a source of the magnetic field?The term solenoid refers to a long, thin loop of wire, often wrapped around a metallic core. Solenoids produce a magnetic field when an electric current is passed through them. Solenoids are significant because they can create and regulate magnetic fields and can be used as electromagnets.
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Use the information from the graph to answer the
question.
Velocity (m/s)
45
40
35
30
25
20
15
Velocity vs. Time
0 2
4
6 8
Time (s)
10
12
What is the acceleration of the object?
m/s²
The velocity after 8 seconds 15 m/s. the acceleration of the object m/s² 2.
What is velocity ?
Velocity is a vector quantity that expresses both the speed and direction of an object's motion. It can be described in terms of both magnitude and direction, and is measured in terms of meters per second (m/s). Velocity is an important concept in physics because it is used to describe the motion of objects. In addition, it is used to calculate the force of an object, the acceleration of an object, and the momentum of an object.
Velocity is an important concept in physics and engineering, as it is used to measure the rate at which objects move, as well as the rate of change of an object's motion. Velocity can also be used to calculate the work done on an object and to determine the direction of an object's motion.
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Your classmate hernando wants to draw lines that create a sense of energy and movement in his drawing. Which type of line would you recommend to him to best articulate this feeling?.
I would suggest him to use curved lines to articulate the energy and movement motion n his drawing
Arcs of lines may be referred to as curves segments, rays, or lines depending on how they are linked.
A typical illustration of a curve is the arc of a circle, often known as a circular arc. The term "great arc in a sphere" refers to an arc of a great circle or a great ellipse or a spheroid.The numerous types of curves include simple curves, closed curves, simple closed curves, transcendental curves, and algebraic curves.
A curved line that encircles a central point is what is referred to be a circle. The line is continuously and uniformly curved. If a circle can be folded into two identical pieces, it is considered to be symmetrical.
Thus curved lines can be used to best articulate the feeling.
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Answer:
Curved
Explanation:
Two pans of a balance are 79 cm apart.
The fulcrum of the balance has been shifted 0.99 cm away from the center by a dishonest shopkeeper.
By what percentage is the true weight of the goods being marked up by the shopkeeper?
Assume the balance has negligible mass.
Answer in units of %.
The true weight of the goods is being marked up by 0.0126%.
Solving for the percentage is the true weight of the goods being marked up by the shopkeeper:The percentage markup can be found using the formula:
distance moved x 100%
original distance
In this case, the original distance is 79 cm and the distance moved is 0.99 cm, so the formula would be:
= 0.99 x 100%
79
= 0.0126%
Hence, the true weight of the goods is being marked up by 0.0126%.
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The largest moon in the solar system is Ganymede, a moon of Jupiter. Ganymede orbits at a distance of 1.07×109m from the center of Jupiter with an orbital period of about 6.18×105s. Find the mass of Jupiter.
The moon of Jupiter, Ganymede is the largest moon in the solar system. The mass of Jupiter when the orbital period and the distance from the centre of the orbit are given is calculated to be 1.57 × 10²⁷ kg.
The time required to complete one revolution in an orbit around the planet is known as the Orbital Time period of motion. The orbital distance's cube is directly proportional to the square of the time period.
Given that,
Orbital distance R = 1.07 × 10⁹ m
Time period T = 6.18 × 10⁵ s
We know the formula of time period as,
T² = 4 π² R³/ G M
where, M is the mass of Jupiter
G is the gravitational constant
(6.18 × 10⁵)² = 4 π² (1.07 × 10⁹)³/(6.67 × 10⁻¹¹) M
Making M as subject, we have,
M = 4 π² (1.07 × 10⁹)³/[ (6.67 × 10⁻¹¹) (6.18 × 10⁵)²] = 1.57 × 10²⁷ kg
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A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?.
The minimum value for the roller coaster car’s centripetal acceleration at the top of the loop is g downward.
When the roller coaster car is going at less than the minimum speed, it means there will be too much force, and the roller coaster car will fall from the track. At the minimum speed, the centripetal force at the top of the loop will be exactly equal to the force of gravity, mg, since no normal force will be needed.
What is normal force?The normal force is the force which surfaces exert to prevent solid objects from passing through each other. Normal force is a contact force. If two surfaces are not in contact, they cannot exert a normal force on each other.
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A 1.3 kg ball of putty is released from rest and falls vertically 1.2 m until it strikes a hard floor, where it comes to rest in a 0.025s time interval. What is the magnitude of the average force exerted on the ball by the floor during the collision?
The magnitude of the average force exerted on the ball is 4992 N.
What is force?Force is the product of mass and acceleration. The S.I unit of force is newton(N)
To calculate the magnitude of the average force, we use the formula below.
Formula:
F = 2ms/t².................... Equation 1Where:
F = Forcem = Masss = Distancet = TimeFrom the question,
Given:
m = 1.3 kgs = 1.2 mt = 0.025 sSubstitute these values into equation 1
F = 2×1.3×1.2/0.025²F = 4992 NHence, the average force is 4992 N.
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Which word best describes covalent bonding?
Answer: Option (a)
Solution: The covalent bond is best described as the bond where one atom shares its electron(s) with another neighboring atom to become stable. Here, the word “co” represents jointly and “valent” represents valency shared by them. Therefore, option (a) is the most appropriate choice amongst all the provided options.
An object is moving at a speed of 920 yards every 3. 5 hours. Express this speed in miles per week. Round your answer to the nearest tenth.
The required speed of 920 yards every 3. 5 hours is terms of miles per week is 25 miles/week.
What is speed?Speed is what it means. the speed at which an object's location changes in any direction. The distance travelled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity.
According to question:
We have,
Speed = 920/3.5 = 262.85 yd/hour
We know that
1 yard/hour = 0.0954545 mile/week
So,
262.85 yd/hour = 25 miles/week
Thus, speed of 920 yards every 3. 5 hours is 25 miles/week.
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Lab-Kinematics in 1 Dimension: Determine Total Distance and Net Displacement from Velocity vs. Time Graphs
On a velocity-time graph, the object's displacement is indicated by the area under the line. The distance is the zone under a speed-time graph.
Displacement on a velocity-time graph: what does it mean?Displacement is the outcome of velocity and time. The area of our graph is obtained by multiplying the velocity and time, which is virtually equivalent to multiplying two lengths. The solution to estimating displacements from a velocity-time graph.
What can we infer from a graph of velocity and time?The amount of acceleration will be determined by the graph's slope. Example If a particle's acceleration is constant (k) and positive, its starting velocity is zero, and it grows linearly from there. The acceleration will be determined by the velocity-time graph's slope.
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Order the molecules from the strongest intermolecular force (top) to the weakest (bottom). Refer the table of electronegativities to help you.
The order of intermolecular forces among the given compounds will be as follows: H F > H Cl > H Br > H I
Electronegativity is defined as the property of the element to attract the shared pair of electrons towards itself.
Strongest intermolecular forces of attraction means that the electronegativity difference between the elements forming bond is more, more polar is the bond.
Electro negativities of the elements are:
Hydrogen: 2.1
Fluorine: 3.98
Chlorine: 3.16
Bromine: 2.96
Iodine: 2.66
Electro negativity difference in H F = 3.98 - 2.1 = 1.88
Electro negativity difference in H Cl = 3.16 - 2.1 = 1.06
Electro negativity difference in H Br = 2.96 - 2.1 = 0.86
Electro negativity difference in H I = 2.66 - 2.1 = 0.56
As, the electronegativity difference of H F is the highest, so it has the strongest intermolecular forces of attraction.
Thus, the order of intermolecular forces among the given compounds is H F > H Cl > H Br > H I.
The given question is incomplete. The complete question is attached in the below attachment.
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