Question 1

Photons with energy of 2.95 eV illuminate a metal surface and it is found that voltage of 0.65 V is required to stop all the electrons that are ejected from the metal by this light.What is the metal?

Accepted Answer

A)  potassium
B)  uranium
C)  magnesium
D)  calcium
E)  cesiumF) B) and E)
G) A) and B)

Question 2

What is the maximum speed of a 0.25-kg ball for it to be diffracted when passing through a 0.85-m wide doorway? (Hint: use the condition for diffraction of w  ≤\le≤  10 λ\lambdaλ .)

Accepted Answer

A)  3.1 * 10-32 m/s
B)  2.7 * 10-32 m/s
C)  4.6 * 10-32 m/s
D)  1.8 * 10-32 m/s
E)  0.53 * 10-32 m/s F) A) and B)
G) C) and D)

Question 3

A pair of silver plates in a vacuum are separated by 1 cm and have a potential difference of 2.0 kV between them.What is the largest wavelength of light that can be shined on the cathode to produce a current through the anode?

Accepted Answer

A)  1.2 * 10-11 m
B)  8.0 * 10-11 m
C)  9.8 * 10-11 m
D)  6.2 * 10-10 m
E)  1.2 * 10-9 mF) C) and D)
G) A) and B)

Question 4

Nitrogen molecules of mass,m = 4.648 * 10-26 kg each,have a speed of 270 m/s and are incident on a double slit.The spacing between the two slits is 5.28 * 10-9 m.A nitrogen molecule fringe pattern is observed on a screen 60.0 cm beyond the double slit.How far apart are adjacent fringes on the screen?

Accepted Answer

A)  0.40 cm
B)  0.60 cm
C)  0.70 cm
D)  0.50 cmE) A) and B)
F) None of the above

Question 5

A 20.0 kg particle has a deBroglie wavelength of 10.0 cm.What is the smallest momentum uncertainty of the particle if its position uncertainty is 5.00 cm?

Accepted Answer

A)  1.38 * 10-33 kg·m/s
B)  2.17 * 10-33 kg·m/s
C)  1.05 * 10-33 kg·m/s
D)  9.32 * 10-32 kg·m/s
E)  1.54 * 10-33 kg·m/sF) B) and D)
G) B) and E)

Question 6

A beam of monochromatic light has an intensity I and consists of an unknown number of photons.All of the photons have the same wavelength and frequency.The energy of just one of these photons is largest when

Accepted Answer

A)  the intensity of the light beam is largest.
B)  the frequency of the photons is largest.
C)  the wavelength of the photons is largest.
D)  All are correct.E) B) and D)
F) C) and D)

Question 7

A 2 MeV x-ray photon is scattered from a free electron at rest into an angle of 45 ∘\circ∘ .What is the wavelength of the scattered photon?

Accepted Answer

A)  0.62 pm
B)  0.71 pm
C)  1.10 pm
D)  1.33 pm
E)  1.72 pm F) B) and C)
G) A) and C)

Question 8

During Compton scattering,when a beam of monochromatic x-ray photons scatter off stationary electrons,their wavelength increases.What is the scattering angle relative to the direction of the incident photons which corresponds to the maximum possible increase in the wavelength of the photons?

Accepted Answer

A)  0 ∘\circ∘ 
B)  90 ∘\circ∘ 
C)  180 ∘\circ∘ 
D)  There is no maximum value for the increase in wavelength.
E)  The wavelength of the x-ray photons doesn't increase.It decreases. F) D) and E)
G) A) and E)

Question 9

Nitrogen molecules of mass,m = 4.648 * 10-26 kg each,and are incident on a double slit.The spacing between the two slits is 5.28 * 10-9 m.A nitrogen molecule fringe pattern,with fringes 0.40 cm apart,is observed on a screen 60.0 cm beyond the double slit.What is the speed of the nitrogen molecules?

Accepted Answer

A)  358 m/s
B)  405 m/s
C)  270 m/s
D)  179 m/sE) A) and D)
F) B) and C)

Question 10

A 20.0 kg particle has a deBroglie wavelength of 10.0 cm.What is the smallest position uncertainty of the particle if its speed uncertainty is 3.31 * 10-35 m/s?

Accepted Answer

A)  7.15 cm
B)  5.00 cm
C)  8.33 cm
D)  6.63 cm
E)  7.97 cmF) A) and D)
G) A) and E)

Question 11

The intensity of the radiation from the sun has a maximum around 550 nm.The surface temperature of the Sun is

Accepted Answer

A)  15939 K.
B)  9543 K.
C)  7856 K.
D)  5269 K.E) None of the above
F) A) and C)

Question 12

A particular metal is illuminated by UV photons of wavelength 210 nm,and electrons up to 1.25 eV are emitted from the surface.What is the maximum KE of photoelectrons emitted when the UV photons are,instead,175 nm in wavelength?

Accepted Answer

A)  1.18 eV
B)  2.44 eV
C)  5.90 eV
D)  7.09 eVE) A) and D)
F) A) and B)

Question 13

X-rays having energy of 350.0 keV undergo Compton scattering from a target.The scattered rays are detected at 30.0 ∘\circ∘  relative to the incident rays.The energy of the scattered x-ray is

Accepted Answer

A)  467 keV.
B)  216 keV.
C)  385 keV.
D)  154 keV.
E)  321 keV. F) D) and E)
G) All of the above

Question 14

If a particle has a rest mass of 9.1 * 10-29 kg,what speed (m/s) would give it a de Broglie wavelength of 3.63 * 10-9 m?

Accepted Answer

A)  2 * 10 -7
B)  2 * 10 3
C)  5 * 10 -3
D)  5 * 10 -2
E)  5F) C) and D)
G) A) and B)

Question 15

At what frequency does the blackbody radiation from a microwave source have its maximum intensity? The temperature of the microwave source is 2.73 K.

Accepted Answer

A)  3.41 * 1011 Hz
B)  2.39 * 1011 Hz
C)  1.95 * 1011 Hz
D)  2.83 * 1011 HzE) A) and B)
F) A) and C)

Question 16

A proton (rest mass 938.3 MeV/c2) is confined to a small region of space 2.0 nm wide.What is the uncertainty on its speed due to this confinement?

Accepted Answer

A)  32 m/s
B)  63 m/s
C)  400 m/s
D)  200 m/sE) A) and D)
F) B) and D)

Question 17

A nocturnal bird's eye can to detect 20 photons per second of monochromatic light with a wavelength of 523 nm.The corresponding power of monochromatic light a nocturnal bird's eye can detect is

Accepted Answer

A)  5.31 * 10-16 W.
B)  3.16 * 10-17 W.
C)  8.92 * 10-17 W.
D)  2.33 * 10-18 W.
E)  7.61 * 10-18 WF) C) and E)
G) A) and B)

Question 18

The photoelectric minimum (threshold) frequency for a material is 2.23 * 1015 Hz.What is the work function for this material?

Accepted Answer

A)  8.3 eV
B)  4.9 eV
C)  11 eV
D)  9.8 eV
E)  9.2 eVF) B) and D)
G) A) and B)

Question 19

X-rays having energy of 450.0 keV undergo Compton scattering from a target.The scattered rays are detected at 20.0 ∘\circ∘ relative to the incident rays.The energy of the recoiling electron is

Accepted Answer

A)  284 keV.
B)  25.2 keV.
C)  297 keV.
D)  22.6 keV.
E)  255 keV. F) D) and E)
G) C) and D)

Question 20

Pauli exclusion principle states that which two particles can not occupy the same quantum state at the same time and at the same location?

Accepted Answer

A)  fermions
B)  neutrons
C)  protons
D)  electrons
E)  All are correct.F) A) and C)
G) C) and E)

Exam 36: Quantum Physics

If a particle has a rest mass of 9.1 * 10^-29 kg,what speed (m/s) would give it a de Broglie wavelength of 3.63 * 10^-9 m?

Correct Answer
verified

Correct Answer
verified

A pair of silver plates in a vacuum are separated by 1 cm and have a potential difference of 2.0 kV between them.What is the largest wavelength of light that can be shined on the cathode to produce a current through the anode?

Correct Answer
verified

During Compton scattering,when a beam of monochromatic x-ray photons scatter off stationary electrons,their wavelength increases.What is the scattering angle relative to the direction of the incident photons which corresponds to the maximum possible increase in the wavelength of the photons?

Correct Answer
verified

At what frequency does the blackbody radiation from a microwave source have its maximum intensity? The temperature of the microwave source is 2.73 K.

Correct Answer
verified

A beam of monochromatic light has an intensity I and consists of an unknown number of photons.All of the photons have the same wavelength and frequency.The energy of just one of these photons is largest when

Correct Answer
verified

A proton (rest mass 938.3 MeV/c²) is confined to a small region of space 2.0 nm wide.What is the uncertainty on its speed due to this confinement?

Correct Answer
verified

X-rays having energy of 350.0 keV undergo Compton scattering from a target.The scattered rays are detected at 30.0^$\circ$ relative to the incident rays.The energy of the scattered x-ray is

Correct Answer
verified

A 2 MeV x-ray photon is scattered from a free electron at rest into an angle of 45^$\circ$.What is the wavelength of the scattered photon?

Correct Answer
verified

The photoelectric minimum (threshold) frequency for a material is 2.23 * 10¹⁵ Hz.What is the work function for this material?

Correct Answer
verified

Correct Answer
verified

Pauli exclusion principle states that which two particles can not occupy the same quantum state at the same time and at the same location?

Correct Answer
verified

A 20.0 kg particle has a deBroglie wavelength of 10.0 cm.What is the smallest position uncertainty of the particle if its speed uncertainty is 3.31 * 10^-35 m/s?

Correct Answer
verified

A 20.0 kg particle has a deBroglie wavelength of 10.0 cm.What is the smallest momentum uncertainty of the particle if its position uncertainty is 5.00 cm?

Correct Answer
verified

A particular metal is illuminated by UV photons of wavelength 210 nm,and electrons up to 1.25 eV are emitted from the surface.What is the maximum KE of photoelectrons emitted when the UV photons are,instead,175 nm in wavelength?

Correct Answer
verified

X-rays having energy of 450.0 keV undergo Compton scattering from a target.The scattered rays are detected at 20.0^$\circ$relative to the incident rays.The energy of the recoiling electron is

Correct Answer
verified

The intensity of the radiation from the sun has a maximum around 550 nm.The surface temperature of the Sun is

Correct Answer
verified

A nocturnal bird's eye can to detect 20 photons per second of monochromatic light with a wavelength of 523 nm.The corresponding power of monochromatic light a nocturnal bird's eye can detect is

Correct Answer
verified

What is the maximum speed of a 0.25-kg ball for it to be diffracted when passing through a 0.85-m wide doorway? (Hint: use the condition for diffraction of w $\le$ 10 $\lambda$ .)

Correct Answer
verified

Photons with energy of 2.95 eV illuminate a metal surface and it is found that voltage of 0.65 V is required to stop all the electrons that are ejected from the metal by this light.What is the metal?

Correct Answer
verified

Exam 36: Quantum Physics

If a particle has a rest mass of 9.1 * 10-29 kg,what speed (m/s) would give it a de Broglie wavelength of 3.63 * 10-9 m?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A pair of silver plates in a vacuum are separated by 1 cm and have a potential difference of 2.0 kV between them.What is the largest wavelength of light that can be shined on the cathode to produce a current through the anode?

Correct AnswerverifiedShow Answer

During Compton scattering,when a beam of monochromatic x-ray photons scatter off stationary electrons,their wavelength increases.What is the scattering angle relative to the direction of the incident photons which corresponds to the maximum possible increase in the wavelength of the photons?

Correct AnswerverifiedShow Answer

At what frequency does the blackbody radiation from a microwave source have its maximum intensity? The temperature of the microwave source is 2.73 K.

Correct AnswerverifiedShow Answer

A beam of monochromatic light has an intensity I and consists of an unknown number of photons.All of the photons have the same wavelength and frequency.The energy of just one of these photons is largest when

Correct AnswerverifiedShow Answer

A proton (rest mass 938.3 MeV/c2) is confined to a small region of space 2.0 nm wide.What is the uncertainty on its speed due to this confinement?

Correct AnswerverifiedShow Answer

X-rays having energy of 350.0 keV undergo Compton scattering from a target.The scattered rays are detected at 30.0 ∘\circ∘ relative to the incident rays.The energy of the scattered x-ray is

Correct AnswerverifiedShow Answer

A 2 MeV x-ray photon is scattered from a free electron at rest into an angle of 45 ∘\circ∘ .What is the wavelength of the scattered photon?

Correct AnswerverifiedShow Answer

The photoelectric minimum (threshold) frequency for a material is 2.23 * 1015 Hz.What is the work function for this material?

Correct AnswerverifiedShow Answer

Nitrogen molecules of mass,m = 4.648 * 10-26 kg each,and are incident on a double slit.The spacing between the two slits is 5.28 * 10-9 m.A nitrogen molecule fringe pattern,with fringes 0.40 cm apart,is observed on a screen 60.0 cm beyond the double slit.What is the speed of the nitrogen molecules?

Correct AnswerverifiedShow Answer

Pauli exclusion principle states that which two particles can not occupy the same quantum state at the same time and at the same location?

Correct AnswerverifiedShow Answer

A 20.0 kg particle has a deBroglie wavelength of 10.0 cm.What is the smallest position uncertainty of the particle if its speed uncertainty is 3.31 * 10-35 m/s?

Correct AnswerverifiedShow Answer

A 20.0 kg particle has a deBroglie wavelength of 10.0 cm.What is the smallest momentum uncertainty of the particle if its position uncertainty is 5.00 cm?

Correct AnswerverifiedShow Answer

A particular metal is illuminated by UV photons of wavelength 210 nm,and electrons up to 1.25 eV are emitted from the surface.What is the maximum KE of photoelectrons emitted when the UV photons are,instead,175 nm in wavelength?

Correct AnswerverifiedShow Answer

X-rays having energy of 450.0 keV undergo Compton scattering from a target.The scattered rays are detected at 20.0 ∘\circ∘ relative to the incident rays.The energy of the recoiling electron is

Correct AnswerverifiedShow Answer

The intensity of the radiation from the sun has a maximum around 550 nm.The surface temperature of the Sun is

Correct AnswerverifiedShow Answer

A nocturnal bird's eye can to detect 20 photons per second of monochromatic light with a wavelength of 523 nm.The corresponding power of monochromatic light a nocturnal bird's eye can detect is

Correct AnswerverifiedShow Answer

What is the maximum speed of a 0.25-kg ball for it to be diffracted when passing through a 0.85-m wide doorway? (Hint: use the condition for diffraction of w ≤\le≤ 10 λ\lambdaλ .)

Correct AnswerverifiedShow Answer

Photons with energy of 2.95 eV illuminate a metal surface and it is found that voltage of 0.65 V is required to stop all the electrons that are ejected from the metal by this light.What is the metal?

Correct AnswerverifiedShow Answer

If a particle has a rest mass of 9.1 * 10^-29 kg,what speed (m/s) would give it a de Broglie wavelength of 3.63 * 10^-9 m?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A proton (rest mass 938.3 MeV/c²) is confined to a small region of space 2.0 nm wide.What is the uncertainty on its speed due to this confinement?

Correct Answer
verified

X-rays having energy of 350.0 keV undergo Compton scattering from a target.The scattered rays are detected at 30.0^$\circ$ relative to the incident rays.The energy of the scattered x-ray is

Correct Answer
verified

A 2 MeV x-ray photon is scattered from a free electron at rest into an angle of 45^$\circ$.What is the wavelength of the scattered photon?

Correct Answer
verified

The photoelectric minimum (threshold) frequency for a material is 2.23 * 10¹⁵ Hz.What is the work function for this material?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 20.0 kg particle has a deBroglie wavelength of 10.0 cm.What is the smallest position uncertainty of the particle if its speed uncertainty is 3.31 * 10^-35 m/s?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

X-rays having energy of 450.0 keV undergo Compton scattering from a target.The scattered rays are detected at 20.0^$\circ$relative to the incident rays.The energy of the recoiling electron is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the maximum speed of a 0.25-kg ball for it to be diffracted when passing through a 0.85-m wide doorway? (Hint: use the condition for diffraction of w $\le$ 10 $\lambda$ .)

Correct Answer
verified

Correct Answer
verified