A neutron has a mass of 1.67 *10 - 27 kg.The de Broglie wavelength is 1.4 *10 - 10 m.How fast is the neutron going? (in m/s)

A) 3.4 *103 B) 2.8 * 103 C) 3.9 * 103 D) 2.6 * 103 E) 1.7 * 103 A) 3.4 *103 B) 2.8 * 103 C) 3.9 * 103 D) 2.6 * 103 E) 1.7 * 103

A photon whose wavelength is = 5.0 * 10 - 11 m is scattered straight backward.What is the wavelength of the scattered wave?

A) 5.0 *10 - 11 m B) 4.5 *10 - 11 m C) 5.5 *10 - 11 m D) 6.0 *10 - 11 m E) 6.5 *10 - 11 m A) 5.0 *10 - 11 m B) 4.5 *10 - 11 m C) 5.5 *10 - 11 m D) 6.0 *10 - 11 m E) 6.5 *10 - 11 m

If the position of an electron (m = 9.11 *10 - 31 kg)could be measured to within 10 - 30 m,the uncertainty in the magnitude of its speed could be as much as

A) 6 *10 - 34 m/s. B) 6 *1025 m/s. C) 6 * 1030 m/s. D) 1031 m/s. E) 1061 m/s. A) 6 *10 - 34 m/s. B) 6 *1025 m/s. C) 6 * 1030 m/s. D) 1031 m/s. E) 1061 m/s.

Exam 28: Quantum Physics

On a bright and sunny day,the intensity of solar radiation on the Earth's surface is 1 000 W/m².If the average wavelength of the sunlight is 500 nm,how many photons are incident on a square meter of the Earth's surface per second?

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(Short Answer)

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Question 1

Correct Answer:

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2.51 * 10²¹ photons/s

The threshold wavelength for photoelectric emission of a particular substance is 500 nm.What is the work function (in eV)?

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(Multiple Choice)

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Question 2

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Your temperature is 98.6 $\degree$ F.Assuming your skin is a perfect radiator ( $\varepsilon$ = 1),determine the wavelength corresponding to the largest intensity (in $\mu$ m).

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(Multiple Choice)

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Question 3

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A baseball (1 kg)has an energy of 100 joules.If its uncertainty in position is 1 m,what is the percentage uncertainty ( $\Delta$ p/p * 100)in the momentum of the baseball?

(Multiple Choice)

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Question 4

A particle is in the first excited state of a one-dimensional box of length 1.0 m.What is the minimum value of its momentum (in kg . m/s)?

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Question 5

An electron is accelerated through a potential difference of 25 000 V.What is the de Broglie wavelength of the electron (in m)?

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Question 6

A neutron has a mass of 1.67 10 ^- ²⁷ kg.Its de Broglie wavelength is 1.4 10 ^- ¹⁰ m.What temperature would it correspond to if we had a monatomic gas having the same average kinetic energy (in $\degree$ C)?

(Multiple Choice)

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Question 7

How much energy is in a 63 kHz photon of AM-radiation?

(Multiple Choice)

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Question 8

The experimental observation(s)below that require(s)a quantum explanation for the photoelectric effect

(Multiple Choice)

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Question 9

Assume electrons are accelerated through a potential difference of 25 000 V inside a TV picture tube.What is the minimum wavelength that could be produced when the electrons strike the phosphor? (1 Å = 10 ^- ¹⁰ m)

(Multiple Choice)

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Question 10

A neutron has a mass of 1.67 10 ^- ²⁷ kg.The de Broglie wavelength is 1.4 10 ^- ¹⁰ m.How fast is the neutron going? (in m/s)

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Question 11

Film behind a double slit is exposed to light in the following way: First one slit is opened and light is allowed to go through that slit for time $\Delta$ t.Then it is closed and the other slit is opened and light is allowed to go through that slit for the same time $\Delta$ t.When the film is developed the pattern will be

(Multiple Choice)

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Question 12

The "seeing ability" or resolution of radiation is determined by its wavelength.If an atom is approximately 10 ^- ¹⁰ m in diameter,how fast must an electron travel to have a wavelength smaller than the size of an atom?

(Short Answer)

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Question 13

Frank says that quantum mechanics does not apply to baseballs because they do not jump from quantum state to quantum state when being thrown.Francine agrees with him.She says that there is no uncertainty in a baseball's position or momentum.Are they correct,or not,and why?

(Multiple Choice)

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Question 14

What is the maximum kinetic energy (in eV)of a photoelectron when a surface,whose work function is 5.0 eV,is illuminated by photons whose wavelength is 400 nm?

(Multiple Choice)

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Question 15

A particle is in the second excited state of a one-dimensional box of length 1.0 m.What is its momentum (in kg . m/s)?

(Multiple Choice)

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Question 16

A photon whose wavelength is = 5.0 * 10 ^- ¹¹ m is scattered straight backward.What is the wavelength of the scattered wave?

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Question 17

If the position of an electron (m = 9.11 *10 ^- ³¹ kg)could be measured to within 10 ^- ³⁰ m,the uncertainty in the magnitude of its speed could be as much as

(Multiple Choice)

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Question 18

The expectations value of a function f(x)of x when the wave function depends only on x is given by < f(x)> =

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Question 19

When the potential energy of a system is independent of time,the wave function of the system

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Question 20

Showing 1 - 20 of 69

Exam 28: Quantum Physics

On a bright and sunny day,the intensity of solar radiation on the Earth's surface is 1 000 W/m2.If the average wavelength of the sunlight is 500 nm,how many photons are incident on a square meter of the Earth's surface per second?

The threshold wavelength for photoelectric emission of a particular substance is 500 nm.What is the work function (in eV)?

Your temperature is 98.6 °\degree° F.Assuming your skin is a perfect radiator ( ε\varepsilonε = 1),determine the wavelength corresponding to the largest intensity (in μ\muμ m).

A baseball (1 kg)has an energy of 100 joules.If its uncertainty in position is 1 m,what is the percentage uncertainty ( Δ\DeltaΔ p/p * 100)in the momentum of the baseball?

A particle is in the first excited state of a one-dimensional box of length 1.0 m.What is the minimum value of its momentum (in kg . m/s)?

An electron is accelerated through a potential difference of 25 000 V.What is the de Broglie wavelength of the electron (in m)?

A neutron has a mass of 1.67 *10 - 27 kg.Its de Broglie wavelength is 1.4 *10 - 10 m.What temperature would it correspond to if we had a monatomic gas having the same average kinetic energy (in °\degree° C)?

How much energy is in a 63 kHz photon of AM-radiation?

The experimental observation(s)below that require(s)a quantum explanation for the photoelectric effect

Assume electrons are accelerated through a potential difference of 25 000 V inside a TV picture tube.What is the minimum wavelength that could be produced when the electrons strike the phosphor? (1 Å = 10 - 10 m)

A neutron has a mass of 1.67 *10 - 27 kg.The de Broglie wavelength is 1.4 *10 - 10 m.How fast is the neutron going? (in m/s)

The "seeing ability" or resolution of radiation is determined by its wavelength.If an atom is approximately 10 - 10 m in diameter,how fast must an electron travel to have a wavelength smaller than the size of an atom?

Frank says that quantum mechanics does not apply to baseballs because they do not jump from quantum state to quantum state when being thrown.Francine agrees with him.She says that there is no uncertainty in a baseball's position or momentum.Are they correct,or not,and why?

What is the maximum kinetic energy (in eV)of a photoelectron when a surface,whose work function is 5.0 eV,is illuminated by photons whose wavelength is 400 nm?

A particle is in the second excited state of a one-dimensional box of length 1.0 m.What is its momentum (in kg . m/s)?

A photon whose wavelength is = 5.0 * 10 - 11 m is scattered straight backward.What is the wavelength of the scattered wave?

If the position of an electron (m = 9.11 *10 - 31 kg)could be measured to within 10 - 30 m,the uncertainty in the magnitude of its speed could be as much as

The expectations value of a function f(x)of x when the wave function depends only on x is given by < f(x)> =

When the potential energy of a system is independent of time,the wave function of the system

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On a bright and sunny day,the intensity of solar radiation on the Earth's surface is 1 000 W/m².If the average wavelength of the sunlight is 500 nm,how many photons are incident on a square meter of the Earth's surface per second?

Your temperature is 98.6 $\degree$ F.Assuming your skin is a perfect radiator ( $\varepsilon$ = 1),determine the wavelength corresponding to the largest intensity (in $\mu$ m).

A baseball (1 kg)has an energy of 100 joules.If its uncertainty in position is 1 m,what is the percentage uncertainty ( $\Delta$ p/p * 100)in the momentum of the baseball?

A neutron has a mass of 1.67 10 ^- ²⁷ kg.Its de Broglie wavelength is 1.4 10 ^- ¹⁰ m.What temperature would it correspond to if we had a monatomic gas having the same average kinetic energy (in $\degree$ C)?

Assume electrons are accelerated through a potential difference of 25 000 V inside a TV picture tube.What is the minimum wavelength that could be produced when the electrons strike the phosphor? (1 Å = 10 ^- ¹⁰ m)

A neutron has a mass of 1.67 10 ^- ²⁷ kg.The de Broglie wavelength is 1.4 10 ^- ¹⁰ m.How fast is the neutron going? (in m/s)

The "seeing ability" or resolution of radiation is determined by its wavelength.If an atom is approximately 10 ^- ¹⁰ m in diameter,how fast must an electron travel to have a wavelength smaller than the size of an atom?

A photon whose wavelength is = 5.0 * 10 ^- ¹¹ m is scattered straight backward.What is the wavelength of the scattered wave?

If the position of an electron (m = 9.11 *10 ^- ³¹ kg)could be measured to within 10 ^- ³⁰ m,the uncertainty in the magnitude of its speed could be as much as