If the momentum of an electron is 1.95 × 10-27 kg ∙ m/s,what is its de Broglie wavelength? (h = 6.626 × 10-34 J ∙ s)

A) 340 nm B) 210 nm C) 170 nm D) 420 nm E) 520 nm A) 340 nm B) 210 nm C) 170 nm D) 420 nm E) 520 nm

Exam 30: Quantum Physics

When light of wavelength 350 nm is incident on a metal surface,the stopping potential of the photoelectrons is measured to be 0.500 V.What is the work function of this metal? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

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Question 1

Correct Answer:

Verified

If you double the frequency of the light in a laser beam,but keep the number of photons per second in the beam fixed,which of the following statements are correct? (There could be more than one correct choice. )

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(Multiple Choice)

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Question 2

Correct Answer:

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B,D

Which of the following actions will increase the de Broglie wavelength of a speck of dust? (There could be more than one correct choice. )

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Question 3

Correct Answer:

Verified

C,D,E

What is the cutoff (threshold)frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

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Question 4

What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

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Question 5

If the momentum of an electron is 1.95 × 10^-²⁷ kg ∙ m/s,what is its de Broglie wavelength? (h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 6

A helium-neon laser emits light at 632.8 nm.If the laser emits Photons/second,what is its power output in mW? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 7

If the maximum possible accuracy in measuring the velocity of a particle increases,the maximum possible accuracy in measuring its position will

(Multiple Choice)

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Question 8

If a proton and an electron have the same speed,which one has the longer de Broglie wavelength?

(Multiple Choice)

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Question 9

If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum,what is the speed of the electron? (m_electron = 9.11 × 10^-31 kg,c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

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Question 10

What frequency of electromagnetic radiation has photons of energy 4.7 × 10^-25 J? (h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 11

The spacing of the atoms of a crystal is 159 pm.A monoenergetic beam of neutrons directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal.What is the energy of each of the neutrons? (m_neutron = 1.675 × 10^-27 kg,1 eV = 1.6 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

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Question 12

If the sunlight from a star peaks at a wavelength of 0.55 µm,what temperature does this imply for the surface of that star? The constant in Wien's law is 0.00290 m ∙ K.

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Question 13

What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ∙ K.

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Question 14

A proton and an electron are both accelerated to the same final speed.If λ_p is the de Broglie wavelength of the proton and λ_e is the de Broglie wavelength of the electron,then

(Multiple Choice)

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Question 15

If the wavelength of a photon is doubled,what happens to its energy?

(Multiple Choice)

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Question 16

Each photon in a beam of light has an energy of 4.20 eV.What is the wavelength of this light? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

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Question 17

If the work function of a metal surface is 2.20 eV,what frequency of incident light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 18

A photocathode having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 3.4 eV.What is maximum kinetic energy of the photoelectrons produced? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

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Question 19

After an electron has been accelerated through a potential difference of 0.15 kV,what is its de Broglie wavelength? (e = 1.60 × 10^-1⁹ C,m_electron = 9.11 × 10^-31 kg,h = 6.626 × 10^-34 J ∙ s)

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Question 20

Showing 1 - 20 of 88

Exam 30: Quantum Physics

When light of wavelength 350 nm is incident on a metal surface,the stopping potential of the photoelectrons is measured to be 0.500 V.What is the work function of this metal? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

If you double the frequency of the light in a laser beam,but keep the number of photons per second in the beam fixed,which of the following statements are correct? (There could be more than one correct choice. )

Which of the following actions will increase the de Broglie wavelength of a speck of dust? (There could be more than one correct choice. )

What is the cutoff (threshold)frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10-19 J,h = 6.626 × 10-34 J ∙ s)

What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

If the momentum of an electron is 1.95 × 10-27 kg ∙ m/s,what is its de Broglie wavelength? (h = 6.626 × 10-34 J ∙ s)

A helium-neon laser emits light at 632.8 nm.If the laser emits Photons/second,what is its power output in mW? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

If the maximum possible accuracy in measuring the velocity of a particle increases,the maximum possible accuracy in measuring its position will

If a proton and an electron have the same speed,which one has the longer de Broglie wavelength?

If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum,what is the speed of the electron? (melectron = 9.11 × 10-31 kg,c = 3.0 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

What frequency of electromagnetic radiation has photons of energy 4.7 × 10-25 J? (h = 6.626 × 10-34 J ∙ s)

If the sunlight from a star peaks at a wavelength of 0.55 µm,what temperature does this imply for the surface of that star? The constant in Wien's law is 0.00290 m ∙ K.

What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ∙ K.

A proton and an electron are both accelerated to the same final speed.If λp is the de Broglie wavelength of the proton and λe is the de Broglie wavelength of the electron,then

If the wavelength of a photon is doubled,what happens to its energy?

Each photon in a beam of light has an energy of 4.20 eV.What is the wavelength of this light? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

If the work function of a metal surface is 2.20 eV,what frequency of incident light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface? (1 eV = 1.60 × 10-19 J,h = 6.626 × 10-34 J ∙ s)

A photocathode having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 3.4 eV.What is maximum kinetic energy of the photoelectrons produced? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

After an electron has been accelerated through a potential difference of 0.15 kV,what is its de Broglie wavelength? (e = 1.60 × 10-19 C,melectron = 9.11 × 10-31 kg,h = 6.626 × 10-34 J ∙ s)

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When light of wavelength 350 nm is incident on a metal surface,the stopping potential of the photoelectrons is measured to be 0.500 V.What is the work function of this metal? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

What is the cutoff (threshold)frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

If the momentum of an electron is 1.95 × 10^-²⁷ kg ∙ m/s,what is its de Broglie wavelength? (h = 6.626 × 10^-34 J ∙ s)

A helium-neon laser emits light at 632.8 nm.If the laser emits Photons/second,what is its power output in mW? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum,what is the speed of the electron? (m_electron = 9.11 × 10^-31 kg,c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

What frequency of electromagnetic radiation has photons of energy 4.7 × 10^-25 J? (h = 6.626 × 10^-34 J ∙ s)

A proton and an electron are both accelerated to the same final speed.If λ_p is the de Broglie wavelength of the proton and λ_e is the de Broglie wavelength of the electron,then

Each photon in a beam of light has an energy of 4.20 eV.What is the wavelength of this light? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

If the work function of a metal surface is 2.20 eV,what frequency of incident light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

A photocathode having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 3.4 eV.What is maximum kinetic energy of the photoelectrons produced? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

After an electron has been accelerated through a potential difference of 0.15 kV,what is its de Broglie wavelength? (e = 1.60 × 10^-1⁹ C,m_electron = 9.11 × 10^-31 kg,h = 6.626 × 10^-34 J ∙ s)