A helium-neon laser emits light at 632.8 nm.If the laser emits 1.82 F1F1F1S1F1F1F10 1017 photons/second,what is its power output in mW?

A) 57.2 mW B) 28.6 mW C) 37.2 mW D) 45.7 mW A) 57.2 mW B) 28.6 mW C) 37.2 mW D) 45.7 mW

Exam 28: Quantum Physics

A blue laser beam is incident on a metallic surface,causing electrons to be ejected from the metal.If the frequency of the laser beam is increased while the intensity of the beam is held fixed,

(Multiple Choice)

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Question 21

A proton and an electron are confined in a very small one-dimensional box.Which object has the lower minimum kinetic energy?

(Multiple Choice)

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Question 22

An electron is confined in a one-dimensional box.Two adjacent allowed energies of the electron are 2.8 × 10^-19 J and 3.5 × 10^-19 J.What is the length of the box?

(Multiple Choice)

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Question 23

If there are two photons with different energies,the one that has a higher energy

(Multiple Choice)

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Question 24

The maximum kinetic energy of photoelectrons from a metal is equal to the work function of that metal.

(True/False)

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Question 25

An electron and a proton move at the same speed.Which has a longer de-Broglie wavelength?

(Multiple Choice)

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Question 26

You measure the velocity of an electron to an accuracy of ±22.6 m/s.What is the minimum uncertainty in its position?

(Multiple Choice)

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Question 27

A photocathode has a work function of 2.4 eV.The photocathode is illuminated with monochromatic radiation whose photon energy is 3.5 eV.The wavelength of the illuminating radiation is closest to:

(Multiple Choice)

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Question 28

Photons all travel at the speed of light so they must all have the same energy.

(True/False)

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Question 29

A helium-neon laser emits light at 632.8 nm.If the laser emits 1.82  10¹⁷ photons/second,what is its power output in mW?

(Multiple Choice)

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Question 30

We do not observe the wave behavior of particles of matter in our daily lives because their de Broglie wavelengths are too small for their wave nature to show up.

(True/False)

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Question 31

A photon of violet light has more energy than a photon of green light.

(True/False)

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Question 32

Typical photoelectric work functions are in the range of a few joules.

(True/False)

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Question 33

Monochromatic light is incident on a metal surface and electrons are ejected.If the intensity of the light is increased,what will happen to the ejection rate and maximum energy of the electrons?

(Multiple Choice)

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Question 34

An electron and a photon having the same wavelength will have the same energy.

(True/False)

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Question 35

A crystalographer uses X-rays that diffract from a crystal in which the spacing between atomic planes is 0.175 nm.If she observes a second-order diffraction at 22.0°,at what angle will she see the first-order diffraction?

(Multiple Choice)

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Question 36

You want to confine an electron in a box so that its minimum energy is 5.0 × 10^-18J.What is the length of the box?

(Multiple Choice)

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Question 37

An electron is trapped in a quantum well that is 48.6 nm wide.Calculate the minimum uncertainty in its velocity.

(Multiple Choice)

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Question 38

A photocathode has a work function of 2.8 eV.The photocathode is illuminated with monochromatic radiation whose photon energy is 4.0 eV.The threshold frequency for photoelectron production is closest to:

(Multiple Choice)

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Question 39

A one-dimensional box contains an electron in the n = 1 state.What is the length of the box if the electron has the same energy as a photon with a wavelength of 600 nm?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 66

Exam 28: Quantum Physics

A blue laser beam is incident on a metallic surface,causing electrons to be ejected from the metal.If the frequency of the laser beam is increased while the intensity of the beam is held fixed,

A proton and an electron are confined in a very small one-dimensional box.Which object has the lower minimum kinetic energy?

An electron is confined in a one-dimensional box.Two adjacent allowed energies of the electron are 2.8 × 10-19 J and 3.5 × 10-19 J.What is the length of the box?

If there are two photons with different energies,the one that has a higher energy

The maximum kinetic energy of photoelectrons from a metal is equal to the work function of that metal.

An electron and a proton move at the same speed.Which has a longer de-Broglie wavelength?

You measure the velocity of an electron to an accuracy of ±22.6 m/s.What is the minimum uncertainty in its position?

A photocathode has a work function of 2.4 eV.The photocathode is illuminated with monochromatic radiation whose photon energy is 3.5 eV.The wavelength of the illuminating radiation is closest to:

Photons all travel at the speed of light so they must all have the same energy.

A helium-neon laser emits light at 632.8 nm.If the laser emits 1.82  1017 photons/second,what is its power output in mW?

We do not observe the wave behavior of particles of matter in our daily lives because their de Broglie wavelengths are too small for their wave nature to show up.

A photon of violet light has more energy than a photon of green light.

Typical photoelectric work functions are in the range of a few joules.

Monochromatic light is incident on a metal surface and electrons are ejected.If the intensity of the light is increased,what will happen to the ejection rate and maximum energy of the electrons?

An electron and a photon having the same wavelength will have the same energy.

A crystalographer uses X-rays that diffract from a crystal in which the spacing between atomic planes is 0.175 nm.If she observes a second-order diffraction at 22.0°,at what angle will she see the first-order diffraction?

You want to confine an electron in a box so that its minimum energy is 5.0 × 10-18 J.What is the length of the box?

An electron is trapped in a quantum well that is 48.6 nm wide.Calculate the minimum uncertainty in its velocity.

A photocathode has a work function of 2.8 eV.The photocathode is illuminated with monochromatic radiation whose photon energy is 4.0 eV.The threshold frequency for photoelectron production is closest to:

A one-dimensional box contains an electron in the n = 1 state.What is the length of the box if the electron has the same energy as a photon with a wavelength of 600 nm?

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An electron is confined in a one-dimensional box.Two adjacent allowed energies of the electron are 2.8 × 10^-19 J and 3.5 × 10^-19 J.What is the length of the box?

A helium-neon laser emits light at 632.8 nm.If the laser emits 1.82  10¹⁷ photons/second,what is its power output in mW?

You want to confine an electron in a box so that its minimum energy is 5.0 × 10^-18J.What is the length of the box?