Question 1

What is the energy of a photon that has the same wavelength as a 11.4-eV electron? (h = 6.63 × 10−34 J⋅s,me = 9.11 × 10-31 kg,1 eV = 1.6 × 10-19 J)

Accepted Answer

A) 1140 eV 
B) 32 eV 
C) 103 eV 
D) 3420 eV 
E) ​1030 eV 
A) 1140 eV 
B) 32 eV 
C) 103 eV 
D) 3420 eV 
E) ​1030 eV

Question 2

If an x-ray machine were designed to operate at two separate accelerating voltages,one double the other,how would the shortest wavelength,λmin,hν,and the maximum frequency,fmax,hν,at the higher voltage compare to those (λmin,lv,fmax,lv)at the lower voltage?
Λmin,hv/ λmin,lv = ________,fmax,hv/ fmax,lv =________:

Accepted Answer

A) 2,2. 
B) 2,1/2. 
C) 1/2,2. 
D) 1/2,1/2. 
A) 2,2. 
B) 2,1/2. 
C) 1/2,2. 
D) 1/2,1/2.

Question 3

What is the wavelength of a monochromatic light beam,where the photon energy is 2.15 eV? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 nm = 10−9 m,and 1 eV = 1.6 × 10−19 J)

Accepted Answer

A) 308 nm 
B) 578 nm 
C) 223 nm 
D) 156 nm 
E) ​475 nm 
A) 308 nm 
B) 578 nm 
C) 223 nm 
D) 156 nm 
E) ​475 nm

Question 4

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 
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 5

X-rays of wavelength of 0.0656 nm undergo Compton scattering from free electrons in carbon.What is the wavelength of photons scattered at 82.5° relative to the incident beam? (h = 6.63 × 10−34 J⋅s,me = 9.11 × 10−31 kg,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

Accepted Answer

A) 0.0656 nm 
B) 0.0677 nm 
C) 0.0848 nm 
D) 0.0719 nm 
E) ​0.0659 nm 
A) 0.0656 nm 
B) 0.0677 nm 
C) 0.0848 nm 
D) 0.0719 nm 
E) ​0.0659 nm

Question 6

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

Question 7

The wave function as derived in Schrödinger's equation is best described as being a measure of which of the following?

Accepted Answer

A) photon beam frequency 
B) photon wavelength 
C) particle wavelength 
D) probability 
A) photon beam frequency 
B) photon wavelength 
C) particle wavelength 
D) probability

Question 8

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 
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 9

A beam of photons of wavelength 0.55 nm undergoes Compton scattering from free electrons.
-​What is the energy of the photons that emerge at a 35° angle with respect to the incident beam?

Accepted Answer

A) ​2.3 keV 
B) ​10.9 keV 
C) ​36.0 keV 
D) ​3.0 keV 
A) ​2.3 keV 
B) ​10.9 keV 
C) ​36.0 keV 
D) ​3.0 keV

Question 10

Of the following energies for photons,which is the least energy that could result in photoelectron production if the work function is 3.77 eV?

Accepted Answer

A) 2.72 eV 
B) 3.19 eV 
C) 4.57 eV 
D) 6.98 eV 
E) ​6.53 eV 
A) 2.72 eV 
B) 3.19 eV 
C) 4.57 eV 
D) 6.98 eV 
E) ​6.53 eV

Question 11

The microwave in the kitchen has a label that indicates it produces its microwaves at a frequency of 2450 MHz.What is the energy associated with one of these microwave photons? (h = 6.63 × 10−34 J⋅s)

Accepted Answer

A) 3.19 × 10-2 eV 
B) 2.45 eV 
C) 1.02 × 10-5 eV 
D) 1.62 eV 
A) 3.19 × 10-2 eV 
B) 2.45 eV 
C) 1.02 × 10-5 eV 
D) 1.62 eV

Question 12

According to the de Broglie hypothesis,which of the following statements is applicable to the wavelength of a moving particle?

Accepted Answer

A) directly proportional to its energy 
B) directly proportional to its momentum 
C) inversely proportional to its energy 
D) inversely proportional to its momentum 
A) directly proportional to its energy 
B) directly proportional to its momentum 
C) inversely proportional to its energy 
D) inversely proportional to its momentum

Question 13

Who was the first to successfully explain the photoelectric effect?

Accepted Answer

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

Question 14

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

Question 15

Who conceived the idea of using a crystal for observing diffraction of x-rays?

Accepted Answer

A) Roentgen 
B) von Laue 
C) W.L.Bragg 
D) W.H.Bragg 
A) Roentgen 
B) von Laue 
C) W.L.Bragg 
D) W.H.Bragg

Question 16

​Light with wavelength 5.6 * 10-7 is used to determine the position of an electron to within the wavelength of the light.What is the resulting uncertainty in the electron's velocity? h = 6.63 *10-34 J.s,me = 9.11 * 10-31 kg

Accepted Answer

A) ​1300 m/s 
B) ​103 m/s 
C) ​207 m/s 
D) ​16,331 m/s 
A) ​1300 m/s 
B) ​103 m/s 
C) ​207 m/s 
D) ​16,331 m/s

Question 17

Of the following photons,which has the highest energy?

Accepted Answer

A) infrared 
B) microwave 
C) visible 
D) ultraviolet 
A) infrared 
B) microwave 
C) visible 
D) ultraviolet

Question 18

If a quantum of radiation has an energy of 2.10 keV,what is its wavelength? (h = 6.63 × 10−34 J⋅s,1 eV = 1.60 × 10−19 J,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

Accepted Answer

A) 0.95 nm 
B) 197 nm 
C) 0.59 nm 
D) 1.24 nm 
E) ​0.14 nm 
A) 0.95 nm 
B) 197 nm 
C) 0.59 nm 
D) 1.24 nm 
E) ​0.14 nm

Question 19

If barium has a work function of 2.6 eV,what is its cutoff wavelength when used as a phototube target? (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) 765 nm 
B) 478 nm 
C) 777 nm 
D) 380 nm 
A) 765 nm 
B) 478 nm 
C) 777 nm 
D) 380 nm

Question 20

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 
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

Exam 27: Quantum Physics

What is the energy of a photon that has the same wavelength as a 11.4-eV electron? (h = 6.63 × 10−34 J⋅s,me = 9.11 × 10-31 kg,1 eV = 1.6 × 10-19 J)

What is the wavelength of a monochromatic light beam,where the photon energy is 2.15 eV? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 nm = 10−9 m,and 1 eV = 1.6 × 10−19 J)

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

X-rays of wavelength of 0.0656 nm undergo Compton scattering from free electrons in carbon.What is the wavelength of photons scattered at 82.5° relative to the incident beam? (h = 6.63 × 10−34 J⋅s,me = 9.11 × 10−31 kg,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

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

The wave function as derived in Schrödinger's equation is best described as being a measure of which of the following?

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

A beam of photons of wavelength 0.55 nm undergoes Compton scattering from free electrons. -​What is the energy of the photons that emerge at a 35° angle with respect to the incident beam?

Of the following energies for photons,which is the least energy that could result in photoelectron production if the work function is 3.77 eV?

The microwave in the kitchen has a label that indicates it produces its microwaves at a frequency of 2450 MHz.What is the energy associated with one of these microwave photons? (h = 6.63 × 10−34 J⋅s)

According to the de Broglie hypothesis,which of the following statements is applicable to the wavelength of a moving particle?

Who was the first to successfully explain the photoelectric effect?

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)

Who conceived the idea of using a crystal for observing diffraction of x-rays?

​Light with wavelength 5.6 * 10-7 is used to determine the position of an electron to within the wavelength of the light.What is the resulting uncertainty in the electron's velocity? h = 6.63 *10-34 J.s,me = 9.11 * 10-31 kg

Of the following photons,which has the highest energy?

If a quantum of radiation has an energy of 2.10 keV,what is its wavelength? (h = 6.63 × 10−34 J⋅s,1 eV = 1.60 × 10−19 J,c = 3.00 × 108 m/s,and 1 nm = 10−9 m)

If barium has a work function of 2.6 eV,what is its cutoff wavelength when used as a phototube target? (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)

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)

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What is the energy of a photon that has the same wavelength as a 11.4-eV electron? (h = 6.63 × 10−³⁴ J⋅s,m_e = 9.11 × 10^-31 kg,1 eV = 1.6 × 10^-19 J)

What is the wavelength of a monochromatic light beam,where the photon energy is 2.15 eV? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 nm = 10−⁹ m,and 1 eV = 1.6 × 10−¹⁹ J)

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

X-rays of wavelength of 0.0656 nm undergo Compton scattering from free electrons in carbon.What is the wavelength of photons scattered at 82.5° relative to the incident beam? (h = 6.63 × 10−³⁴ J⋅s,m_e = 9.11 × 10−³¹ kg,c = 3.00 × 10⁸ m/s,and 1 nm = 10−⁹ m)

A beam of photons of wavelength 0.55 nm undergoes Compton scattering from free electrons. -What is the energy of the photons that emerge at a 35° angle with respect to the incident beam?

The microwave in the kitchen has a label that indicates it produces its microwaves at a frequency of 2450 MHz.What is the energy associated with one of these microwave photons? (h = 6.63 × 10−³⁴ J⋅s)

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)

Light with wavelength 5.6 * 10^-7 is used to determine the position of an electron to within the wavelength of the light.What is the resulting uncertainty in the electron's velocity? h = 6.63 10^-34 J.s,m_e = 9.11 10^-31 kg

If a quantum of radiation has an energy of 2.10 keV,what is its wavelength? (h = 6.63 × 10−³⁴ J⋅s,1 eV = 1.60 × 10−¹⁹ J,c = 3.00 × 10⁸ m/s,and 1 nm = 10−⁹ m)

If barium has a work function of 2.6 eV,what is its cutoff wavelength when used as a phototube target? (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)

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)