Question 1

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

Question 2

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 m 
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 m

Question 3

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

Question 4

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) cesium 
A) potassium 
B) uranium 
C) magnesium 
D) calcium 
E) cesium

Question 5

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

Question 6

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 cm 
A) 0.40 cm 
B) 0.60 cm 
C) 0.70 cm 
D) 0.50 cm

Question 7

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

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) 0S1U1P1$\circ$S1S1P0 
B) 90S1U1P1$\circ$S1S1P0 
C) 180S1U1P1$\circ$S1S1P0 
D) There is no maximum value for the increase in wavelength. 
E) The wavelength of the x-ray photons doesn't increase.It decreases. 
A) 0S1U1P1$\circ$S1S1P0 
B) 90S1U1P1$\circ$S1S1P0 
C) 180S1U1P1$\circ$S1S1P0 
D) There is no maximum value for the increase in wavelength. 
E) The wavelength of the x-ray photons doesn't increase.It decreases.

Question 9

X-rays having energy of 350.0 keV undergo Compton scattering from a target.The scattered rays are detected at 30.0S1U1P1$\circ$S1S1P0 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. 
A) 467 keV. 
B) 216 keV. 
C) 385 keV. 
D) 154 keV. 
E) 321 keV.

Question 10

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. 
A) 15939 K. 
B) 9543 K. 
C) 7856 K. 
D) 5269 K.

Question 11

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/s 
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/s

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 eV 
A) 1.18 eV 
B) 2.44 eV 
C) 5.90 eV 
D) 7.09 eV

Question 13

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

Question 14

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. 
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.

Question 15

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

Question 16

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

Question 17

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$\lambda$.)

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 
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

Question 18

A 2 MeV x-ray photon is scattered from a free electron at rest into an angle of 45S1U1P1$\circ$S1S1P0.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 
A) 0.62 pm 
B) 0.71 pm 
C) 1.10 pm 
D) 1.33 pm 
E) 1.72 pm

Question 19

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 W 
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 W

Question 20

X-rays having energy of 450.0 keV undergo Compton scattering from a target.The scattered rays are detected at 20.0S1U1P1$\circ$S1S1P0relative 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. 
A) 284 keV. 
B) 25.2 keV. 
C) 297 keV. 
D) 22.6 keV. 
E) 255 keV.

Exam 36: Quantum Physics

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.

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?

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?

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?

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?

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?

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?

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

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

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?

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?

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?

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

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

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

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 .)

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?

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

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

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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?

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?

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

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?

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

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 $\lambda$ .)

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?

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