Question 1

If a blackbody is at 2650° C,what will be the peak wavelength emitted? Wien's displacement constant b = 2.898 × 10-3 m·K.

Accepted Answer

A) 1.09 μm 
B) 0.34 μm 
C) 0.99 μm 
D) 9.9 μm 
E) ​0.11 μm 
A) 1.09 μm 
B) 0.34 μm 
C) 0.99 μm 
D) 9.9 μm 
E) ​0.11 μm

Question 2

If the minimum x-ray wavelength produced is 17 × 10−12 m,through what potential are the electrons accelerated in order to generate this radiation? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 eV = 1.60 × 10−19 J)

Accepted Answer

A) 1.17E+5 V 
B) 2.44E+4 V 
C) 1.10E+4 V 
D) 7.31E+4 V 
E) ​1.87E+5 V 
A) 1.17E+5 V 
B) 2.44E+4 V 
C) 1.10E+4 V 
D) 7.31E+4 V 
E) ​1.87E+5 V

Question 3

Which process cannot occur if only one photon is involved?

Accepted Answer

A) Compton effect 
B) pair production 
C) the photoelectric effect 
D) x-ray production 
A) Compton effect 
B) pair production 
C) the photoelectric effect 
D) x-ray production

Question 4

What is the de Broglie wavelength for a proton (m = 1.67 × 10−27 kg)moving at a speed of 2.9 × 106 m/s? (h = 6.63 × 10−34 J⋅s)

Accepted Answer

A) 6.84E-14 m 
B) 2.06E-14 m 
C) 2.29E-13 m 
D) 1.37E-13 m 
E) ​3.82E-13 m 
A) 6.84E-14 m 
B) 2.06E-14 m 
C) 2.29E-13 m 
D) 1.37E-13 m 
E) ​3.82E-13 m

Question 5

A detector absorbs 1.0 × 109 photons of monochromatic light and their total energy is found to be 0.33 nJ.What is the wavelength associated with these photons? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s)

Accepted Answer

A) 600 nm 
B) 540 nm 
C) 400 nm 
D) 500 nm 
A) 600 nm 
B) 540 nm 
C) 400 nm 
D) 500 nm

Question 6

As the temperature of a radiation emitting blackbody becomes higher,what happens to the peak wavelength of the radiation?

Accepted Answer

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

Question 7

Starting from rest,an electron accelerates through a potential difference of 51.6 V.What is its de Broglie wavelength? (h = 6.63 × 10−34 J⋅s,me = 9.11 × 10−31 kg,and 1 eV = 1.60 × 10−19 J)

Accepted Answer

A) 4.4E+13 m 
B) 2.4E-10 m 
C) 1.7E-10 m 
D) 1.1E-24 m 
E) ​2.6E-11 m 
A) 4.4E+13 m 
B) 2.4E-10 m 
C) 1.7E-10 m 
D) 1.1E-24 m 
E) ​2.6E-11 m

Question 8

Which change will not change the kinetic energy of the most energetic electrons emitted in the photoelectric effect?

Accepted Answer

A) changing the brightness of the light 
B) changing the frequency of the light 
C) changing the metal the light is hitting 
D) All of the above will change the electron's kinetic energy. 
A) changing the brightness of the light 
B) changing the frequency of the light 
C) changing the metal the light is hitting 
D) All of the above will change the electron's kinetic energy.

Question 9

A beam of photons of wavelength 0.55 nm undergoes Compton scattering from free electrons.
-​What is the momentum of the photons that emerge at a 55° angle with respect to the incident beam?

Accepted Answer

A) ​1.20E-24 kg·m/s 
B) ​1.20E-33 kg·m/s 
C) ​3.65E-34 kg·m/s 
D) ​8.31E+23 kg·m/s 
A) ​1.20E-24 kg·m/s 
B) ​1.20E-33 kg·m/s 
C) ​3.65E-34 kg·m/s 
D) ​8.31E+23 kg·m/s

Question 10

Classical theories predict that most of the energy from a blackbody should be radiated:

Accepted Answer

A) as thermal radiation in the infrared region. 
B) at the wavelength given by Wien's displacement law. 
C) as ultraviolet light. 
D) a blackbody should not radiate. 
A) as thermal radiation in the infrared region. 
B) at the wavelength given by Wien's displacement law. 
C) as ultraviolet light. 
D) a blackbody should not radiate.

Question 11

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 
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 12

​What is the kinetic energy of the recoiling electrons?

Accepted Answer

A) ​56.9 J 
B) ​51.5 J 
C) ​34.3 J 
D) ​13.7 J 
A) ​56.9 J 
B) ​51.5 J 
C) ​34.3 J 
D) ​13.7 J

Question 13

The ultraviolet catastrophe predicts that:

Accepted Answer

A) all objects should radiate extreme amounts of ultraviolet light. 
B) as an object gets hotter its light will change from dull red to blue white. 
C) a black body can absorb an infinite amount of radiation if the radiation is in the ultraviolet region. 
D) the radiated energy approaches zero as the wavelength approaches zero. 
A) all objects should radiate extreme amounts of ultraviolet light. 
B) as an object gets hotter its light will change from dull red to blue white. 
C) a black body can absorb an infinite amount of radiation if the radiation is in the ultraviolet region. 
D) the radiated energy approaches zero as the wavelength approaches zero.

Question 14

Bragg reflection results in a first-order maximum at 12.2°.In this case,at what angle would the second-order maximum occur?

Accepted Answer

A) 24.4° 
B) 12.2° 
C) 7.79° 
D) 25.0° 
E) ​78.5° 
A) 24.4° 
B) 12.2° 
C) 7.79° 
D) 25.0° 
E) ​78.5°

Question 15

Which of the following statements best describes the relation between the quantum theory and the photoelectric effect experiment?

Accepted Answer

A) Quantum theory explains the photoelectric effect. 
B) The photoelectric effect contradicts quantum theory. 
C) Quantum theory has no bearing on the photoelectric effect. 
D) The photoelectric effect explains quantum theory. 
A) Quantum theory explains the photoelectric effect. 
B) The photoelectric effect contradicts quantum theory. 
C) Quantum theory has no bearing on the photoelectric effect. 
D) The photoelectric effect explains quantum theory.

Question 16

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. 
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 17

Which of the following is an indication that one is dealing with a wave property instead of a particle property?

Accepted Answer

A) energy 
B) quanta 
C) interference 
D) momentum 
A) energy 
B) quanta 
C) interference 
D) momentum

Question 18

A monochromatic light beam is incident on a barium target,which has a work function of 2.6 eV.If a stopping potential of 1.2 V is required,what is the light beam photon energy?

Accepted Answer

A) 2.6 eV 
B) 1.4 eV 
C) 1.2 eV 
D) 3.8 eV 
E) ​0.7 
A) 2.6 eV 
B) 1.4 eV 
C) 1.2 eV 
D) 3.8 eV 
E) ​0.7

Question 19

In the Compton effect,what is the greatest change in wavelength that can occur? (h = 6.63 × 10-34 J·s,melectron = 9.11 × 10-31 kg,and c = 3.00 × 108 m/s)

Accepted Answer

A) 2.43 × 10-12 m 
B) 4.85 × 10-12 m 
C) equal to the incident wavelength 
D) infinite 
A) 2.43 × 10-12 m 
B) 4.85 × 10-12 m 
C) equal to the incident wavelength 
D) infinite

Question 20

According to Heisenberg,as the uncertainty in the measurement of a particle's momentum is reduced by a factor of 2,by what factor is the uncertainty in that same particle's position changed?

Accepted Answer

A) 1/2 
B) 1 
C) 2 
D) 4 
A) 1/2 
B) 1 
C) 2 
D) 4

Exam 27: Quantum Physics

If a blackbody is at 2650° C,what will be the peak wavelength emitted? Wien's displacement constant b = 2.898 × 10-3 m·K.

If the minimum x-ray wavelength produced is 17 × 10−12 m,through what potential are the electrons accelerated in order to generate this radiation? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 eV = 1.60 × 10−19 J)

Which process cannot occur if only one photon is involved?

What is the de Broglie wavelength for a proton (m = 1.67 × 10−27 kg)moving at a speed of 2.9 × 106 m/s? (h = 6.63 × 10−34 J⋅s)

A detector absorbs 1.0 × 109 photons of monochromatic light and their total energy is found to be 0.33 nJ.What is the wavelength associated with these photons? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s)

As the temperature of a radiation emitting blackbody becomes higher,what happens to the peak wavelength of the radiation?

Starting from rest,an electron accelerates through a potential difference of 51.6 V.What is its de Broglie wavelength? (h = 6.63 × 10−34 J⋅s,me = 9.11 × 10−31 kg,and 1 eV = 1.60 × 10−19 J)

Which change will not change the kinetic energy of the most energetic electrons emitted in the photoelectric effect?

A beam of photons of wavelength 0.55 nm undergoes Compton scattering from free electrons. -​What is the momentum of the photons that emerge at a 55° angle with respect to the incident beam?

Classical theories predict that most of the energy from a blackbody should be radiated:

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)

​What is the kinetic energy of the recoiling electrons?

The ultraviolet catastrophe predicts that:

Bragg reflection results in a first-order maximum at 12.2°.In this case,at what angle would the second-order maximum occur?

Which of the following statements best describes the relation between the quantum theory and the photoelectric effect experiment?

Rosalind Franklin was

Which of the following is an indication that one is dealing with a wave property instead of a particle property?

A monochromatic light beam is incident on a barium target,which has a work function of 2.6 eV.If a stopping potential of 1.2 V is required,what is the light beam photon energy?

In the Compton effect,what is the greatest change in wavelength that can occur? (h = 6.63 × 10-34 J·s,melectron = 9.11 × 10-31 kg,and c = 3.00 × 108 m/s)

According to Heisenberg,as the uncertainty in the measurement of a particle's momentum is reduced by a factor of 2,by what factor is the uncertainty in that same particle's position changed?

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If a blackbody is at 2650° C,what will be the peak wavelength emitted? Wien's displacement constant b = 2.898 × 10^-3 m·K.

If the minimum x-ray wavelength produced is 17 × 10−¹² m,through what potential are the electrons accelerated in order to generate this radiation? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,and 1 eV = 1.60 × 10−¹⁹ J)

What is the de Broglie wavelength for a proton (m = 1.67 × 10−²⁷ kg)moving at a speed of 2.9 × 10⁶ m/s? (h = 6.63 × 10−³⁴ J⋅s)

A detector absorbs 1.0 × 10⁹ photons of monochromatic light and their total energy is found to be 0.33 nJ.What is the wavelength associated with these photons? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s)

Starting from rest,an electron accelerates through a potential difference of 51.6 V.What is its de Broglie wavelength? (h = 6.63 × 10−³⁴ J⋅s,m_e = 9.11 × 10−³¹ kg,and 1 eV = 1.60 × 10−¹⁹ J)

A beam of photons of wavelength 0.55 nm undergoes Compton scattering from free electrons. -What is the momentum of the photons that emerge at a 55° angle with respect to the incident beam?

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)

What is the kinetic energy of the recoiling electrons?

In the Compton effect,what is the greatest change in wavelength that can occur? (h = 6.63 × 10^-34 J·s,m_electron = 9.11 × 10^-31 kg,and c = 3.00 × 10⁸ m/s)