Question 1

What is the frequency of monochromatic light where the photon energy is 4.3 × 10−19 J? (h = 6.63 × 10−34 J⋅s)

Accepted Answer

A)   4.3E+15 Hz
B)   2.1E+15 Hz
C)   6.5E+14 Hz
D)   1.9E+14 Hz
E)   ​6.5E+13 Hz

Question 2

Due to the dual nature of light and matter,either can act in an experiment as if it is a wave or a particle.In which experiment is the wave aspect exhibited for matter?

Accepted Answer

A)   the Davisson and Germer experiment
B)   the photoelectric effect
C)   pair production
D)   Compton scattering

Question 3

Of photons of red,yellow,light,and blue light,which photons have the greatest energy?

Accepted Answer

A)   red
B)   yellow
C)   green
D)   blue

Question 4

Who was the first to successfully explain the photoelectric effect?

Accepted Answer

A)   Planck
B)   Young
C)   Bohr
D)   Einstein

Question 5

In an x-ray diffraction experiment,using x-rays of wavelength λ = 0.434 × 10−10 m,a first-order maximum occurred at 8° off the crystal plane.Find the distance d between crystal planes.

Accepted Answer

A)   1.56E-10 m
B)   2.19E-11 m
C)   4.88E-10 m
D)   1.70E-9 m
E)   ​3.12E-10 m

Question 6

Changing the accelerating voltage of an x-ray machine without changing the target material must change:

Accepted Answer

A)   the work function of the material.
B)   the wavelength of all the x-rays produced.
C)   the wavelength of the minimum wavelength x-ray that will be produced.
D)   Both b and c are correct.

Question 7

The Compton wavelength,h/mec,equals 0.002 43 nm.In Compton scattering,what is the greatest shift,Δλ,in wavelength that can occur?

Accepted Answer

A)   Δλ > 2 h/mec
B)   Δλ = 2 h/mec
C)   Δλ = h/mec
D)   Δλ ec

Question 8

According to Einstein,as the wavelength of the incident monochromatic light beam becomes shorter,the work function of a target material in a phototube:

Accepted Answer

A)   increases.
B)   decreases.
C)   remains constant.
D)   is directly proportional to wavelength.

Question 9

Rosalind Franklin was:

Accepted Answer

A)   the maiden name of the wife of a president.
B)   the producer of the x-ray diffraction photographs that led to the DNA structure.
C)   the person who discovered that salt forms a crystal.
D)   the discoverer of x-rays.

Question 10

An ultraviolet light beam having a wavelength of 217 nm is incident on a molybdenum surface with work function of 4.9 eV.What is the stopping potential? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.6 × 10−19 J,and 1 nm = 10−9 m)

Accepted Answer

A)   10.6 V
B)   5.3 V
C)   0.8 V
D)   0.4 V
E)   ​5.7 V

Question 11

A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 1.85 mW.How many photons are emitted each second? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

Accepted Answer

A)   5.9E+15
B)   3.7E+34
C)   5.9E+24
D)   5.9E+18
E)   ​1.2E+17

Question 12

Light of wavelength 439 nm is incident on a metallic surface with a resultant photoelectric stopping potential of 1.2 V.What is the work function of the metal? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and 1 nm = 10−9 m)

Accepted Answer

A)   1.63 eV
B)   2.83 eV
C)   4.03 eV
D)   0.82 eV
E)   ​2.02 eV

Question 13

Light of wavelength 6.9 × 10−7 m has an energy of: (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s)

Accepted Answer

A)   2.9E-19 J
B)   9.6E-20 J
C)   3.1E-19 J
D)   4.3E-20 J
E)   ​3.2E-20 J

Question 14

Light of wavelength 521 nm is incident on a target metal that has a work function of 1.6 eV.What stopping potential is required for this combination in a phototube? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and 1 nm = 10−9 m)

Accepted Answer

A)   4.0 V
B)   0.8 V
C)   2.0 V
D)   0.4 V
E)   ​2.4 V

Question 15

How much energy (in eV) does a photon of orange light (λ = 609 nm) have? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and 1 nm = 10−9 m)

Accepted Answer

A)   3.27 eV
B)   0.31 eV
C)   2.04 eV
D)   0.68 eV
E)   ​5.23 eV

Question 16

In Bragg's law,2d sin θ = mλ,how is θ measured?

Accepted Answer

A)   from the reflecting crystal plane
B)   from the normal to the reflecting crystal plane
C)   from the direction of the incident beam
D)   from the normal to the direction of the incident beam

Question 17

Blue light will not eject electrons from a certain metal;however,which one of the following may possibly eject electrons from that metal?

Accepted Answer

A)   infrared
B)   ultraviolet
C)   red
D)   green

Question 18

The de Broglie wavelength of a 0.069 kg golf ball is 4.67 × 10−34m.What is its speed? (h = 6.63 × 10−34 J⋅s)

Accepted Answer

A)   10 m/s
B)   21 m/s
C)   3.1 m/s
D)   90 m/s
E)   ​4.5 m/s

Question 19

A quantum of radiation has an energy of 1.5 keV.What is its frequency? (h = 6.63 × 10−34 J⋅s and 1 eV = 1.60 × 10−19 J)

Accepted Answer

A)   3.6E+14 Hz
B)   3.6E+17 Hz
C)   2.3E+17 Hz
D)   2.4E+18 Hz
E)   ​1.4E+17 Hz

Question 20

The Compton experiment demonstrated which of the following when an x-ray photon collides with an electron?

Accepted Answer

A)   Momentum is conserved.
B)   Energy is conserved.
C)   Momentum and energy are both conserved.
D)   Wavelength of scattered photon equals that of incident photon.

Exam 27: Quantum Physics Blackbody Radiation and Plancks Hypothesis

Due to the dual nature of light and matter,either can act in an experiment as if it is a wave or a particle.In which experiment is the wave aspect exhibited for matter?

Correct AnswerverifiedShow Answer

Light of wavelength 6.9 × 10−7 m has an energy of: (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s)

Correct AnswerverifiedShow Answer

Light of wavelength 521 nm is incident on a target metal that has a work function of 1.6 eV.What stopping potential is required for this combination in a phototube? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and 1 nm = 10−9 m)

Correct AnswerverifiedShow Answer

Of photons of red,yellow,light,and blue light,which photons have the greatest energy?

Correct AnswerverifiedShow Answer

Blue light will not eject electrons from a certain metal;however,which one of the following may possibly eject electrons from that metal?

Correct AnswerverifiedShow Answer

In an x-ray diffraction experiment,using x-rays of wavelength λ = 0.434 × 10−10 m,a first-order maximum occurred at 8° off the crystal plane.Find the distance d between crystal planes.

Correct AnswerverifiedShow Answer

The Compton experiment demonstrated which of the following when an x-ray photon collides with an electron?

Correct AnswerverifiedShow Answer

An ultraviolet light beam having a wavelength of 217 nm is incident on a molybdenum surface with work function of 4.9 eV.What is the stopping potential? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.6 × 10−19 J,and 1 nm = 10−9 m)

Correct AnswerverifiedShow Answer

In Bragg's law,2d sin θ = mλ,how is θ measured?

Correct AnswerverifiedShow Answer

According to Einstein,as the wavelength of the incident monochromatic light beam becomes shorter,the work function of a target material in a phototube:

Correct AnswerverifiedShow Answer

Light of wavelength 439 nm is incident on a metallic surface with a resultant photoelectric stopping potential of 1.2 V.What is the work function of the metal? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and 1 nm = 10−9 m)

Correct AnswerverifiedShow Answer

How much energy (in eV) does a photon of orange light (λ = 609 nm) have? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and 1 nm = 10−9 m)

Correct AnswerverifiedShow Answer

A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 1.85 mW.How many photons are emitted each second? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

Correct AnswerverifiedShow Answer

Changing the accelerating voltage of an x-ray machine without changing the target material must change:

Correct AnswerverifiedShow Answer

What is the frequency of monochromatic light where the photon energy is 4.3 × 10−19 J? (h = 6.63 × 10−34 J⋅s)

Correct AnswerverifiedShow Answer

Rosalind Franklin was:

Correct AnswerverifiedShow Answer

A quantum of radiation has an energy of 1.5 keV.What is its frequency? (h = 6.63 × 10−34 J⋅s and 1 eV = 1.60 × 10−19 J)

Correct AnswerverifiedShow Answer

The Compton wavelength,h/mec,equals 0.002 43 nm.In Compton scattering,what is the greatest shift,Δλ,in wavelength that can occur?

Correct AnswerverifiedShow Answer

Who was the first to successfully explain the photoelectric effect?

Correct AnswerverifiedShow Answer

The de Broglie wavelength of a 0.069 kg golf ball is 4.67 × 10−34m.What is its speed? (h = 6.63 × 10−34 J⋅s)

Correct AnswerverifiedShow Answer

Correct Answer
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Light of wavelength 6.9 × 10−⁷ m has an energy of: (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s)

Correct Answer
verified

Light of wavelength 521 nm is incident on a target metal that has a work function of 1.6 eV.What stopping potential is required for this combination in a phototube? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10−¹⁹ J,and 1 nm = 10−⁹ m)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In an x-ray diffraction experiment,using x-rays of wavelength λ = 0.434 × 10−¹⁰ m,a first-order maximum occurred at 8° off the crystal plane.Find the distance d between crystal planes.

Correct Answer
verified

Correct Answer
verified

An ultraviolet light beam having a wavelength of 217 nm is incident on a molybdenum surface with work function of 4.9 eV.What is the stopping potential? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.6 × 10−¹⁹ J,and 1 nm = 10−⁹ m)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Light of wavelength 439 nm is incident on a metallic surface with a resultant photoelectric stopping potential of 1.2 V.What is the work function of the metal? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10−¹⁹ J,and 1 nm = 10−⁹ m)

Correct Answer
verified

How much energy (in eV) does a photon of orange light (λ = 609 nm) have? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10−¹⁹ J,and 1 nm = 10−⁹ m)

Correct Answer
verified

A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 1.85 mW.How many photons are emitted each second? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,and 1 nm = 10−⁹ m)

Correct Answer
verified

Correct Answer
verified

What is the frequency of monochromatic light where the photon energy is 4.3 × 10−¹⁹ J? (h = 6.63 × 10−³⁴ J⋅s)

Correct Answer
verified

Correct Answer
verified

A quantum of radiation has an energy of 1.5 keV.What is its frequency? (h = 6.63 × 10−³⁴ J⋅s and 1 eV = 1.60 × 10−¹⁹ J)

Correct Answer
verified

The Compton wavelength,h/m_ec,equals 0.002 43 nm.In Compton scattering,what is the greatest shift,Δλ,in wavelength that can occur?

Correct Answer
verified

Correct Answer
verified

The de Broglie wavelength of a 0.069 kg golf ball is 4.67 × 10−³⁴m.What is its speed? (h = 6.63 × 10−³⁴ J⋅s)

Correct Answer
verified