Question 1

The blackbody radiation from a microwave source has its maximum intensity at a wavelength of 0.792 mm.What is the temperature of the microwave source?

Accepted Answer

A) 3.66 K 
B) 2.34 K 
C) 2.73 K 
D) 4.09 K 
A) 3.66 K 
B) 2.34 K 
C) 2.73 K 
D) 4.09 K

Question 2

A metal has a chemical potential of 8 eV.What is the probability that an electron will occupy a state with E = 8.1 eV at 600 K?

Accepted Answer

A) 0.02 
B) 0.09 
C) 0.13 
D) 0.25 
A) 0.02 
B) 0.09 
C) 0.13 
D) 0.25

Question 3

Through what potential difference must an electron be accelerated to have a wavelength of 632.8 nm corresponding to the wavelength of the red light of a He-Ne laser?

Accepted Answer

A) 3.77 * 10-6 V 
B) 5.56 * 10-4 V 
C) 1.25 * 10-2 V 
D) 3.77 V 
A) 3.77 * 10-6 V 
B) 5.56 * 10-4 V 
C) 1.25 * 10-2 V 
D) 3.77 V

Question 4

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

Accepted Answer

A) 1.06 m 
B) 7.92 m 
C) 1.06 mm 
D) 7.92 mm 
A) 1.06 m 
B) 7.92 m 
C) 1.06 mm 
D) 7.92 mm

Question 5

X-rays of wavelength 8.9 pm are Compton scattered.What is the longest wavelength X-rays emitted in the process?

Accepted Answer

A) 8.9 pm 
B) 12.5 pm 
C) 13.8 pm 
D) 16.7 pm 
E) 18.4 pm 
A) 8.9 pm 
B) 12.5 pm 
C) 13.8 pm 
D) 16.7 pm 
E) 18.4 pm

Question 6

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

Accepted Answer

A) 1.30 * 10-35 m/s 
B) 2.64 * 10-35 m/s 
C) 3.31 * 10-35 m/s 
D) 3.98 * 10-35 m/s 
E) 5.27 * 10-35 m/s 
A) 1.30 * 10-35 m/s 
B) 2.64 * 10-35 m/s 
C) 3.31 * 10-35 m/s 
D) 3.98 * 10-35 m/s 
E) 5.27 * 10-35 m/s

Question 7

A helium-neon laser puts out a beam of red light with frequency 4.74 * 1014 Hz.Determine the energy of each photon at that frequency.

Accepted Answer

A) 1.96 eV 
B) 2.50 eV 
C) 8.81 eV 
D) 13.6 eV 
E) 25.0 eV 
A) 1.96 eV 
B) 2.50 eV 
C) 8.81 eV 
D) 13.6 eV 
E) 25.0 eV

Question 8

Which one of the following statements is true if the intensity of a light beam is increased while its frequency is kept the same?

Accepted Answer

A) The photons gain higher speeds. 
B) The energy of the photons is increased. 
C) The number of photons per unit time is increased. 
D) The wavelength of the light is increased. 
A) The photons gain higher speeds. 
B) The energy of the photons is increased. 
C) The number of photons per unit time is increased. 
D) The wavelength of the light is increased.

Question 9

A nitrogen molecule of mass,m = 4.648 * 10-26 kg,has a speed of 270 m/s.Determine its deBroglie wavelength.

Accepted Answer

A) 5.28 * 10-11 m 
B) 6.19 * 10-11 m 
C) 7.18 * 10-11 m 
D) 7.92 * 10-11 m 
A) 5.28 * 10-11 m 
B) 6.19 * 10-11 m 
C) 7.18 * 10-11 m 
D) 7.92 * 10-11 m

Question 10

The Pauli exclusion principle applies to

Accepted Answer

A) fermions only. 
B) bosons only. 
C) both fermions and bosons. 
D) electrons only. 
A) fermions only. 
B) bosons only. 
C) both fermions and bosons. 
D) electrons only.

Question 11

If a metal has a work function 4.3 eV what is the minimum frequency for photo-emission?

Accepted Answer

A) 3.5 * 108 Hz 
B) 3.0 * 1010 Hz 
C) 10.0 * 108 Hz 
D) 1.04 *1015 Hz 
E) 1.0 Hz 
A) 3.5 * 108 Hz 
B) 3.0 * 1010 Hz 
C) 10.0 * 108 Hz 
D) 1.04 *1015 Hz 
E) 1.0 Hz

Question 12

The uncertainty principle says that for a given particle,one cannot determine precisely at the same time

Accepted Answer

A) position and momentum. 
B) energy and position. 
C) velocity and momentum. 
D) velocity and energy. 
E) energy and momentum. 
A) position and momentum. 
B) energy and position. 
C) velocity and momentum. 
D) velocity and energy. 
E) energy and momentum.

Question 13

X-rays undergo Compton scattering from a target.The scattered rays have an energy of 300 keV and are detected at 30.0S1U1P1$\circ$S1S1P0relative to the incident rays.The energy of the incident x-ray is

Accepted Answer

A) 289 keV. 
B) 412 keV. 
C) 350 keV. 
D) 341 keV. 
E) 326 keV. 
A) 289 keV. 
B) 412 keV. 
C) 350 keV. 
D) 341 keV. 
E) 326 keV.

Question 14

The work functions for three metals X,Y.and Z are 4,5,and 6 eV,respectively.Photoelectrons are created when UV light shines on these metals.The photoelectrons from which metal would have the largest stopping voltage?

Accepted Answer

A) Z 
B) Y 
C) X 
A) Z 
B) Y 
C) X

Question 15

X-rays having energy of 350.0 keV undergo Compton scattering from a target.The scattered rays have a kinetic energy of 300 keV.At what angle,relative to the incident rays ar they scattered?

Accepted Answer

A) 40.9S1U1P1$\circ$S1S1P0 
B) 32.1S1U1P1$\circ$S1S1P0 
C) 36.4S1U1P1$\circ$S1S1P0 
D) 30.0S1U1P1$\circ$S1S1P0 
E) 43.9S1U1P1$\circ$S1S1P0 
A) 40.9S1U1P1$\circ$S1S1P0 
B) 32.1S1U1P1$\circ$S1S1P0 
C) 36.4S1U1P1$\circ$S1S1P0 
D) 30.0S1U1P1$\circ$S1S1P0 
E) 43.9S1U1P1$\circ$S1S1P0

Question 16

What is the ratio of deBroglie wavelengths of a 100 MeV kinetic energy proton to a 100 MeV kinetic energy electron?

Accepted Answer

A) 0.02 
B) 0.23 
C) 2.3 
D) 23.0 
E) 230 
A) 0.02 
B) 0.23 
C) 2.3 
D) 23.0 
E) 230

Question 17

Which of the following has the smallest deBroglie wavelength?

Accepted Answer

A) an electron travelling at 80% the speed of light 
B) a proton travelling at 20% the speed of light 
C) a carbon nucleus travelling at 70% the speed of light 
D) a helium nucleus travelling at 80% the speed of light 
E) a lithium nucleus travelling at 50% the speed of light 
A) an electron travelling at 80% the speed of light 
B) a proton travelling at 20% the speed of light 
C) a carbon nucleus travelling at 70% the speed of light 
D) a helium nucleus travelling at 80% the speed of light 
E) a lithium nucleus travelling at 50% the speed of light

Question 18

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 smallest 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 19

An einstein (E)is a unit of measurement equal to Avogadro's Number (6.02 * 1023)of photons.How much energy is contained in one einstein of red light ($\lambda$ = 650 nm)?

Accepted Answer

A) 0.18 MJ 
B) 0.93 MJ 
C) 1.1 MJ 
D) 3.9 MJ 
E) 6.1 MJ 
A) 0.18 MJ 
B) 0.93 MJ 
C) 1.1 MJ 
D) 3.9 MJ 
E) 6.1 MJ

Question 20

How many photons of green light with a wavelength of 500 nm are necessary to have a total energy of 1.0 $\mu$J?

Accepted Answer

A) 2 
B) 2.5 * 1012 
C) 6.0 * 1014 
D) 1.6 * 1031 
E) 3.0 * 1033 
A) 2 
B) 2.5 * 1012 
C) 6.0 * 1014 
D) 1.6 * 1031 
E) 3.0 * 1033

Exam 36: Quantum Physics

The blackbody radiation from a microwave source has its maximum intensity at a wavelength of 0.792 mm.What is the temperature of the microwave source?

A metal has a chemical potential of 8 eV.What is the probability that an electron will occupy a state with E = 8.1 eV at 600 K?

Through what potential difference must an electron be accelerated to have a wavelength of 632.8 nm corresponding to the wavelength of the red light of a He-Ne laser?

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

X-rays of wavelength 8.9 pm are Compton scattered.What is the longest wavelength X-rays emitted in the process?

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

A helium-neon laser puts out a beam of red light with frequency 4.74 * 1014 Hz.Determine the energy of each photon at that frequency.

Which one of the following statements is true if the intensity of a light beam is increased while its frequency is kept the same?

A nitrogen molecule of mass,m = 4.648 * 10-26 kg,has a speed of 270 m/s.Determine its deBroglie wavelength.

The Pauli exclusion principle applies to

If a metal has a work function 4.3 eV what is the minimum frequency for photo-emission?

The uncertainty principle says that for a given particle,one cannot determine precisely at the same time

X-rays undergo Compton scattering from a target.The scattered rays have an energy of 300 keV and are detected at 30.0 ∘\circ∘ relative to the incident rays.The energy of the incident x-ray is

The work functions for three metals X,Y.and Z are 4,5,and 6 eV,respectively.Photoelectrons are created when UV light shines on these metals.The photoelectrons from which metal would have the largest stopping voltage?

X-rays having energy of 350.0 keV undergo Compton scattering from a target.The scattered rays have a kinetic energy of 300 keV.At what angle,relative to the incident rays ar they scattered?

What is the ratio of deBroglie wavelengths of a 100 MeV kinetic energy proton to a 100 MeV kinetic energy electron?

Which of the following has the smallest deBroglie wavelength?

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 smallest when

An einstein (E)is a unit of measurement equal to Avogadro's Number (6.02 * 1023)of photons.How much energy is contained in one einstein of red light ( λ\lambdaλ = 650 nm)?

How many photons of green light with a wavelength of 500 nm are necessary to have a total energy of 1.0 μ\muμ J?

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A helium-neon laser puts out a beam of red light with frequency 4.74 * 10¹⁴ Hz.Determine the energy of each photon at that frequency.

A nitrogen molecule of mass,m = 4.648 * 10^-26 kg,has a speed of 270 m/s.Determine its deBroglie wavelength.

X-rays undergo Compton scattering from a target.The scattered rays have an energy of 300 keV and are detected at 30.0^$\circ$relative to the incident rays.The energy of the incident x-ray is

An einstein (E)is a unit of measurement equal to Avogadro's Number (6.02 * 10²³)of photons.How much energy is contained in one einstein of red light ( $\lambda$ = 650 nm)?

How many photons of green light with a wavelength of 500 nm are necessary to have a total energy of 1.0 $\mu$ J?