Violet light has a wavelength from 380 nm to 420 nm.
What velocity must a free electron have in order to exhibit the same wavelength as a violet photon with a
wavelength of 415 nm?
Answers
This question involves the concepts of de Broglie's wavelength and momentum.
The velocity of the electron must be "1754.27 m/s".
de Broglie's wavelength is a wavelength associated with a moving matter particle. It is connected to the momentum of the particle by the following formula:
[tex]P =\frac{h}{\lambda}\\\\mv=\frac{h}{\lambda}\\\\v=\frac{h}{m\lambda}\\\\[/tex]
where,
v = velocity of electron = ?
h = Plamk's Constant = 6.625 x 10⁻³⁴ J.s
m = mass of electron = 9.1 x 10⁻³¹ kg
λ = de Broglie's wavelength = 415 nm = 4.15 x 10⁻⁷ m
Therefrore,
[tex]v=\frac{6.625\ x\ 10^{-34}\ J.s}{(9.1\ x\ 10^{-31}\ kg)(4.15\ x\ 10^{-7}\ m)}[/tex]
v = 1754.27 m/s
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Related Questions
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An unknown substance has a boiling point (oC) 20.0. Predict if the substance will be a Gas, Solid or liquid at the room temperature (25oC)?
Question 14 options:
Liquid
Gas
Solid
None of the above
Answers
If a particular utility burned 6.17 million tons of coal that was 2.00% sulfur by weight, how many tons of sulfur dioxide was emitted?
Answers
246800 tons of sulfur dioxide was emitted by the utility company who burned 6.17 million tons of coal.
6.17 million tons of coal contain 2.00% sulfur, hence the weight of sulfur is:
Weight of sulfur = 2% of 6.17 million tons = 0.02 * 6170000 = 123400 tons
123400 tons of sulfur is found in 6.17 million tons of coal
The weight of sulfur dioxide is twice that of sulfur, hence:
Amount of sulfur dioxide emitted = 2 * 123400 tons = 246800 tons
246800 tons of sulfur dioxide was emitted.
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Which sentence from the article BEST describes HOW fireworks produce colors in the sky?
(A)
It needs an oxidizer, a fuel and a chemical mixture to produce the color.
(B)
Over the years, scientists have staged various chemical reactions to produce fireworks of different
colors.
(C)
The color of that light depends on what chemical elements are present.
(D)
When the casing explodes, pellets containing the chemical color mixtures fly out.
Answers
Fireworks need an oxidizer, fuel, and a chemical mixture to produce the colour in the sky. Therefore, option (A) is correct.
How do colours come from firecrackers?The chemicals which are used in crackers are the main reason for the colours in the sky. The colours in the fireworks come from different compounds which are the binder and the colourant. The colourant chemicals provide the colours in the firework while the binder is the agent that binds the fuel and is responsible to burn up the colourant in the firework.
The colourants in the firecrackers can be generated with the use of various metallic salts. These salts can be defined as iconic compounds which possess an anion or an acid and a cation or a base. The metal salts are responsible for generating intense colours when they are burned.
For example, if use calcium salts in the firework will produce an orange colour, and copper salts will produce a bright blue colour.
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In which container are the particles of water moving fastest? In which container are the particles moving slowest
Answers
Answer:
Particles move faster the farther they are apart, so the container with the most spread out particles.
please help me with the attachment down bellow its about metal nonmetal and metalloids
Answers
Answer:-
a. Non metals
b. Metals
c. Metals
d. Nonmetal
e. Metalloid
f. Metalloid
g. Metal
h. Nonmetal
i. Metal
j. Metal
k. Nonmetal
l. Nonmetal
Hope this helps you!
The burning of fossil fuels contributes to the addition of greenhouse gases to the atmosphere. These gases trap thermal energy in the Earth’s atmosphere. Which of the following would be the most reasonable changes that could result from an increase in the burning of fossil fuels?
Answers
Explanation:
The burning of fossil fuels contributes to the addition of greenhouse gases to the atmosphere. These gases trap thermal energy in the Earth's atmosphere.
The materials which contain hydrocarbons which are generated from the remains of decay of plants and animals that are buried underground for many years are called fossil fuels.
What causes by burning fossil fuels?The burning of fossil fuels can affect the environment, climatic conditions and human health. The burning of fossil fuels produces large amount of green house gases like CO₂, CH₄, etc. The increase in the amount of green house gases increases the heat and temperature of the earth's surface which leads to global warming.
The increase of temperature due to global warming can cause rise in the sea level, the glaciers of the earth will melt and coastal areas will be submerged under water due to this.
The burning of fossil fuels also releases toxic gases like SO₂, NO₂ which can cause acid rain and the emission these gases causes air pollution.
Thus the burning of fossil fuels has adverse effects.
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A sample of gold has a mass of 100 grams and a volume of 5cm^3, calculate the density by dividing the mass by volume
Answers
Answer:
20cm^2
Explanation:
Here, Density= Mass/ Volume
=100/5
= 20 cm^2
PLEASEE HELPPP!!!!
Hydrogen bonds can be found between molecules of which substance?
1.) CH4
2.) H2
3.) C4H10
4.) NH3
Answers
Answer:
3.) NH3
Brainliest if this helps please? (:
A chemistry teacher adds red food coloring to water and students observed the dye spreading out to fill the container. Is the teacher
demonstrating a physical or chemical change?
Answers
Answer:
its obviously a chemical change
Explanation: Facts
The addition of the food color in water only causes the change in the cor of water but no new substance is formed. Therefore, the teacher is restarting the physical change.
What is a physical change?A physical change can occur when the characteristics of the matter change but the identity does not. Physical changes are classified as: reversible and irreversible. For example, the melting of water is reversible in nature since the melted ice cube will be refrozen.
Physical change can be described as a kind of change where only physical properties of matter such as odor, color, solubility, etc. can change. During physical changes, there is no chemical bonds are broken or formed between atoms of the substance.
The chemical composition as well as the chemical nature of the substance remains unchanged during a physical change. The molecules of matter can rearrange without changing the internal composition of matter.
Therefore, adding food color to water is a physical change as no new substance formed.
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how many grams of magnesium cyanide would you need to add to 275 ml of water to make a 0.075 molal solution
Answers
The mass of magnesium cyanide needed to prepare the solution is 1.57 g
We'll begin by calculating the number of mole of Mg(CN)₂. This can be obtained as follow:
Volume = 275 mL = 275 / 1000 = 0.275 L
Molarity of Mg(CN)₂ = 0.075 M
Mole of Mg(CN)₂ =?Mole = Molarity x Volume
Mole of Mg(CN)₂ = 0.075 × 0.275
Mole of Mg(CN)₂ = 0.020625 mole
Finally, we shall determine the mass of Mg(CN)₂Mole of Mg(CN)₂ = 0.020625 mole
Molar mass of Mg(CN)₂ = 24 + 2(12 + 14) = 76 g/mol
Mass of Mg(CN)₂ =?Mass = mole × molar mass
Mass of Mg(CN)₂ = 0.020625 × 76
Mass of Mg(CN)₂ = 1.57 g
Therefore, 1.57 g of Mg(CN)₂ is needed to prepare the solution
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If anhydrous mgso4 is the desired product, what is the atom economy of this reaction?.
Answers
This problem is referring to an anhydrous salt that is derive from a hydrated Epson salt (magnesium sulfate hydrate) and the atom economy is required. However, not enough information is provided, yet we can use the attached file as a reference to provide a methodology of calculation.
To begin with, we need to calculate the [tex]x[/tex] which refers to the degree of hydration of the salt, so that we use the mass before and after heating the sample to figure out the grams and subsequently moles of water that are in there:
[tex]m_w=3.648g-1.782g=1.866g\\\\n_w=0.103molH_2O[/tex]
Next, since 1.782g corresponds to the anhydrous salt, we calculate the moles in such a amount:
[tex]1.782gMgSO_4*\frac{1molMgSO_4}{120.4gMgSO_4}=0.0148mol[/tex]
Then, we divide the moles of water by those of the anhydrous salt to calculte [tex]x[/tex]:
[tex]x=\frac{0.103mol}{0.0148mol} =6.96=7[/tex]
This means the formula of the hydrate is:
[tex]MgSO_4\ 7H_2O[/tex]
Finally, for the atom economy we just divide the molar mass of the anhydrous salt by that of the hydrate:
[tex]A.E=\frac{120.4g/mol}{246.47g/mol} *100\%\\\\A.E=48.8\%[/tex]
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What is the chemical equation for cellular respiration?
What role does photosynthesis play in our environment?
Answers
Answer:
Cellular Respiration:
C6H12O6 + 6O2 → 6CO2 + 6H20 + energy (Glucose + Oxygen yields Carbon Dioxide + Water + Energy)
Photosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere. Without photosynthesis, the carbon cycle wouldn't occur/exist, oxygen-requiring life would not survive and plants would die. Without photosynthesis there would be little to no oxygen on the planet and Earth would be impossible to live on.
T’Keyah puts salt in ice water and then in boiling water to see which will dissolve faster.Which dissolving rate factor is she testing in these tests?
Answers
Answer:
temperature
Explanation:
its in the book
Answer: agitation
Explanation:
All the members of this family (inner transition metals) are both ______________ and _____________.
(HURRY PLS)
Answers
Answer:
The actinides and the lanthanides
the factor that governs the formula of an ionic compound such as ca3n2 is
Answers
Answer:
the charge or oxidation number on the cation and anion.
Explanation:
The factor that governs the formula of an ionic compound such as Ca3N2 is the charge or oxidation number on the cation and anion.
In the example, Ca has a +2 charge, N has a -3 charge
So we need 3 x ( +2) to balance 2 x (-3) and have an electrically neutral compound, so
+6 -6 =0
The factor that governs the formula of an ionic compound such as Ca₃N₂ is charge.
What are ionic compounds?Those compounds in which ionic bond is present between the cation and anion is known as ionic compound.
The most important factor that is essential for the formation of ionic compounds are charge i.e. positive charge and negative charge. In the given compound Ca₃N₂, Calcium (Ca) is present in the +2 oxidation state and Nitrogen is present in the -3 oxidation state. So due to attraction between these charges they make a ionic compound.
Hence charge is important factor.
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9. Circle the element in each pair that has the greater electronegativity.
→ Ca or Ge
→ Li or o
→ CI or s
→ Br or As
Answers
Answer:
1. Ga
2. O
3. Cl
4. Br
What was the main reason why Alfred Wegener's theory about the movement of the continents was dismissed in 1912?
His theory explained the Earth was expanding as the plates moved
He didn't know about plate tectonics to explain how the plates moved
His map of the ocean floor did not support his theory
His theory was the first to observe the continents fit together
Answers
Answer:
His map of the ocean floor did not support his theory
Explanation:
Alfred Wegner was a great scientistHe observed the plate tectonics of earth and described it in a theory.It was dismissed after viewing his ocean floorAnswer:
He didn't know about plate tectonics to explain how the plates moved
Explanation:
Wegener believed the continents had pushed through the ocean floor. However, he did not have a satisfactory explanation for how this happened. There was no known source of energy large enough to move continents through the sea floor. Also, although scientists had data about the interior of Earth from earthquakes, there were no clues in Earth's crust to show that the continents had broken through the sea floor. Given this lack of evidence to explain the mechanism of continental drift, scientists did not accept this idea.
Calculate the molecular mass of the element
They give:H=1,AI=27,S=32,0=16,Cu=64,P=31,Mg=24,N=14,Na=23
Answers
Answer:
Mg (NO3)2
24 + 2×(14+ 3×16)
24+2×(14+48)
24+2×(62)
24+ 124
=148g
Which statement best describes the effect of radioactive decay on a nucleus?.
Answers
When radioactive decay occurs, the original nucleus splits into daughter nuclei and the resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.
Unstable nuclei often undergo radioactive decay. In a radioactive decay, the unstable nucleus is broken up into other nuclei. Usually, the nuclei formed during radioactive decay are smaller in mass compared to the original nucleus.
Also, the resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.
Answer:
radiation travels from its source in the form of energy waves or energized particles
Explanation:
radiation is energy
whats the formula for lithium nitride
Answers
Answer:
Lithium nitride. Trilithium nitride. 26134-62-3. Lithium nitride (Li3N) Li3N.
Please hurry and help 20 and points and brainelest
Answers
Which statement is always true when nuclear fusion occurs?.
Answers
Answer:
The combined number of protons and neutrons remains constant.
Explanation:
= )
I made a really helpful study set for this assignment on Quizlet. Feel free to visit the following if you need help with the rest of this assignment. Thanks and good luck!
Quizlet - "Physical Science - 5.4 Modeling Fusion and Fission Quick Check"
h t t p s : / / q u i z l e t . c o m / 7 3 7 5 5 3 6 8 0 / p h y s i c a l - s c i e n c e - 5 4 - m o d e l i n g - f u s i o n - a n d - f i s s i o n - q u i c k - c h e c k - f l a s h - c a r d s / ? n e w
which of the following molecules can form hydrogen bonds with others like it?
Answers
Answer:
nitrogen, oxygen and fluorine
If an iron nail was placed in the copper sulfate solution, would you see a
change?
Explain your answer.
Answers
Answer:
Iron displaces copper ions
Explanation:
which means that iron in more reactive than copper.
(Fe2+) and cupric ion (Cu2 +) is converted into metallic copper. Fe (s) + Cu2 + (aq) —→ Fe2+ (aq) + Cu (s).
which type of spectra would be produced by a hydrogen lamp?
Answers
Answer: Emission spectra
The Emission spectrum can be separated into three types:
Line emission spectrum Continuous emission spectra.Band emission spectrumWhat is a Hydrogen lamp?
A gas of hydrogen atoms will create an absorption line spectrum if it is between you (telescope+spectrograph) and a continuum light source, and also an emission line spectrum if considered from a distinguishable angle.
When The emission spectrum of atomic hydrogen has been divided into several spectral sequences, with wavelengths given by the Rydberg formula.
These experimental spectral lines are due to the electron-making transitions between two energy positions in an atom.
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How would you describe the solid-state in terms of motion (ability to move in the space and speed) and distance between molecules?
How would you describe the liquid state in terms of motion (ability to move in the space and speed) and distance between molecules?
How would you describe the gas state in terms of motion (ability to move in the space and speed) and distance between molecules?
Answers
In the gaseous state, the molecules are completely free because there is no intermolecular interaction between the molecules hence they translate at incredibly high velocity.
According to the kinetic theory of matter, the molecules that compose matter are in constant random motion. The nature of this motion varies in the three states of matter which are;
SolidLiquid and GasIn the solid state, the molecules do not translate, they only vibrate and rotate about their mean positions. In the liquids state, the molecules translate but they still have restricted degrees of freedom due to intermolecular interactions. In the gaseous state, the molecules are completely free because there is no intermolecular interaction between the molecules hence they translate at incredibly high velocity.
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Does chlorine have a smaller ionic radius than soium.
Answers
Answer:
sodium atoms are much larger than chlorine atoms but in case of sodium ions they are much smaller thqn chlorine ions
Describe the two categories used to classify physical changes.
Answers
Answer:
Physical changes can be classified as reversible or irreversible. Melting is an example of a reversible physical change.
Explanation:
how to clean garbage disposal with baking soda and vinegar
Answers
Which list includes only bulk properties of matter?
-boiling point, kinetic energy, surface tension
-kinetic energy, the strength of electrical forces, vapour pressure
-boiling point, the strength of electrical forces, vapour pressure
-boiling point, surface tension, vapour pressure
Answers
Based on your lists, choice d contains all bulk properties: boiling point, surface tension, vapour pressure.
Boiling point, surface tension and vapour pressure is the list that includes only bulk properties of matter.
Bulk matter refers to those materials that contains large numbers of atoms, molecules, or ions. Its can be present into all states of matter that may be solid, liquid or gas.
Boiling is a bulk process and occurs throughout the liquid as well as surface tension and vapour pressure is also bulk properties of matter so we can conclude that boiling point, surface tension and vapour pressure is the list that includes only bulk properties of matter.
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