Question 1

According to Einstein,what is true of the stopping potential for a photoelectric current as the wavelength of incident light becomes shorter?

Accepted Answer

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

Question 2

A light-emitting diode has a power output of 0.3 W.If 590 nm is the average wavelength of the source,about how many photons are emitted per second? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

Accepted Answer

A) 1021 
B) 1025 
C) 1018 
D) 1029 
A) 1021 
B) 1025 
C) 1018 
D) 1029 C

Question 3

The spacing between atoms in KCl crystal is 3.1 × 10−10 m.At what angle from the surface will a beam of 2.23 × 10−11-m x-rays be constructively scattered?

Accepted Answer

A) 30° 
B) 2.1° 
C) 0.11° 
D) 20° 
E) ​64° 
A) 30° 
B) 2.1° 
C) 0.11° 
D) 20° 
E) ​64° B

Question 4

A sodium vapor lamp has a power output of 60 W.If 547 nm is the average wavelength of the source,about how many photons are emitted per second? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

Accepted Answer

A) 1018 
B) 1020 
C) 1039 
D) 1029 
E) ​1028 
A) 1018 
B) 1020 
C) 1039 
D) 1029 
E) ​1028

Question 5

The electron microscope's main advantage over the optical microscope is which of the following?

Accepted Answer

A) greater ease of portability 
B) dispenses with need for a lens 
C) higher power lens used 
D) higher resolution possible 
A) greater ease of portability 
B) dispenses with need for a lens 
C) higher power lens used 
D) higher resolution possible

Question 6

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

Question 7

In regard to the Compton scattering experiment with x-rays incident upon a carbon block,as the scattering angle becomes larger,what happens to the magnitude of difference between the incident and scattered wavelengths?

Accepted Answer

A) increases 
B) decreases 
C) remains constant 
D) difference is maximum at a 45° angle of scatter 
A) increases 
B) decreases 
C) remains constant 
D) difference is maximum at a 45° angle of scatter

Question 8

What is the highest frequency of the photons produced by a 29-kV x-ray machine? (h = 6.63 × 10−34 J⋅s)

Accepted Answer

A) 4.4E+18 Hz 
B) 7.0E+15 Hz 
C) 4.4E+15 Hz 
D) 7.0E+18 Hz 
E) ​3.1E+20 Hz 
A) 4.4E+18 Hz 
B) 7.0E+15 Hz 
C) 4.4E+15 Hz 
D) 7.0E+18 Hz 
E) ​3.1E+20 Hz

Question 9

What is the minimum x-ray wavelength produced when electrons are accelerated through a potential of 46,800 V? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 eV = 1.60 × 10−19 J)

Accepted Answer

A) 4.25E-11 m 
B) 8.85E-12 m 
C) 4.01E-12 m 
D) 2.66E-11 m 
E) ​6.80E-11 m 
A) 4.25E-11 m 
B) 8.85E-12 m 
C) 4.01E-12 m 
D) 2.66E-11 m 
E) ​6.80E-11 m

Question 10

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

Question 11

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. 
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 12

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 
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 13

If an electron has a measured wavelength of 0.832 × 10−10 m,what is its kinetic energy?
(h = 6.63 × 10−34 J⋅s,1 eV = 1.6 × 10−19 J,and me = 9.11 × 10−31 kg)

Accepted Answer

A) 7640 eV 
B) 418 eV 
C) 334 eV 
D) 218 eV 
E) ​70 eV 
A) 7640 eV 
B) 418 eV 
C) 334 eV 
D) 218 eV 
E) ​70 eV

Question 14

What potential difference is needed to accelerate a proton from rest to give it a wavelength of 2.00 × 10-12 m?

Accepted Answer

A) 411 V 
B) 206 V 
C) 1650 V 
D) 617 V 
A) 411 V 
B) 206 V 
C) 1650 V 
D) 617 V

Question 15

Which of the following devices represent(s)a practical application of the photoelectric effect?

Accepted Answer

A) hologram 
B) photocell 
C) both of the above choices 
D) none of the above choices 
A) hologram 
B) photocell 
C) both of the above choices 
D) none of the above choices

Question 16

Star A has the peak of its blackbody radiation at λA.Star B has its peak at λB,which is one-third that of λA.If Star A's surface temperature is TA,how does the surface temperature TB of Star B compare?

Accepted Answer

A) TB = TA/9 
B) TB = 3TA 
C) TB = 9 TA 
D) TB = TA/3 
A) TB = TA/9 
B) TB = 3TA 
C) TB = 9 TA 
D) TB = TA/3

Question 17

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

Question 18

X-ray production occurs in which process?

Accepted Answer

A) photons hitting a metal,emitting electrons 
B) electrons hitting a metal,emitting photons 
C) photons hitting a metal,emitting x-rays 
D) electrons hitting a metal and scattering elastically 
A) photons hitting a metal,emitting electrons 
B) electrons hitting a metal,emitting photons 
C) photons hitting a metal,emitting x-rays 
D) electrons hitting a metal and scattering elastically

Question 19

If a monochromatic light beam with quantum energy value of 1.6 eV incident upon a photocell where the work function of the target metal is 0.9 eV,what is the maximum kinetic energy of ejected electrons?

Accepted Answer

A) 2.5 eV 
B) 1.8 eV 
C) 0.7 eV 
D) 3.2 eV 
E) ​1.3 eV 
A) 2.5 eV 
B) 1.8 eV 
C) 0.7 eV 
D) 3.2 eV 
E) ​1.3 eV

Question 20

According to Einstein,increasing the brightness of a beam of light without changing its color will increase:

Accepted Answer

A) the number of photons. 
B) the energy of each photon. 
C) the speed of the photons. 
D) the frequency of the photons. 
A) the number of photons. 
B) the energy of each photon. 
C) the speed of the photons. 
D) the frequency of the photons.

Exam 27: Quantum Physics

According to Einstein,what is true of the stopping potential for a photoelectric current as the wavelength of incident light becomes shorter?

A light-emitting diode has a power output of 0.3 W.If 590 nm is the average wavelength of the source,about how many photons are emitted per second? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

The spacing between atoms in KCl crystal is 3.1 × 10−10 m.At what angle from the surface will a beam of 2.23 × 10−11-m x-rays be constructively scattered?

A sodium vapor lamp has a power output of 60 W.If 547 nm is the average wavelength of the source,about how many photons are emitted per second? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

The electron microscope's main advantage over the optical microscope is which of the following?

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)

In regard to the Compton scattering experiment with x-rays incident upon a carbon block,as the scattering angle becomes larger,what happens to the magnitude of difference between the incident and scattered wavelengths?

What is the highest frequency of the photons produced by a 29-kV x-ray machine? (h = 6.63 × 10−34 J⋅s)

What is the minimum x-ray wavelength produced when electrons are accelerated through a potential of 46,800 V? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 eV = 1.60 × 10−19 J)

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

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

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.

If an electron has a measured wavelength of 0.832 × 10−10 m,what is its kinetic energy? (h = 6.63 × 10−34 J⋅s,1 eV = 1.6 × 10−19 J,and me = 9.11 × 10−31 kg)

What potential difference is needed to accelerate a proton from rest to give it a wavelength of 2.00 × 10-12 m?

Which of the following devices represent(s)a practical application of the photoelectric effect?

Star A has the peak of its blackbody radiation at λA.Star B has its peak at λB,which is one-third that of λA.If Star A's surface temperature is TA,how does the surface temperature TB of Star B compare?

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)

X-ray production occurs in which process?

If a monochromatic light beam with quantum energy value of 1.6 eV incident upon a photocell where the work function of the target metal is 0.9 eV,what is the maximum kinetic energy of ejected electrons?

According to Einstein,increasing the brightness of a beam of light without changing its color will increase:

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Filters

A light-emitting diode has a power output of 0.3 W.If 590 nm is the average wavelength of the source,about how many photons are emitted per second? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,and 1 nm = 10−⁹ m)

The spacing between atoms in KCl crystal is 3.1 × 10−¹⁰ m.At what angle from the surface will a beam of 2.23 × 10−¹¹-m x-rays be constructively scattered?

A sodium vapor lamp has a power output of 60 W.If 547 nm is the average wavelength of the source,about how many photons are emitted per second? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,and 1 nm = 10−⁹ m)

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)

What is the highest frequency of the photons produced by a 29-kV x-ray machine? (h = 6.63 × 10−³⁴ J⋅s)

What is the minimum x-ray wavelength produced when electrons are accelerated through a potential of 46,800 V? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,and 1 eV = 1.60 × 10−¹⁹ J)

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.

If an electron has a measured wavelength of 0.832 × 10−¹⁰ m,what is its kinetic energy? (h = 6.63 × 10−³⁴ J⋅s,1 eV = 1.6 × 10−¹⁹ J,and m_e = 9.11 × 10−³¹ kg)

What potential difference is needed to accelerate a proton from rest to give it a wavelength of 2.00 × 10^-12 m?

Star A has the peak of its blackbody radiation at λ_A.Star B has its peak at λ_B,which is one-third that of λ_A.If Star A's surface temperature is T_A,how does the surface temperature T_B of Star B compare?

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)