Question 1

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

Accepted Answer

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

Question 2

Sources of red,blue,and yellow light each emit light with a power of 50 mW.Which source emits more photons per second?

Accepted Answer

A) the red source 
B) the blue source 
C) the yellow source 
D) They all emit the same number per second. 
A) the red source 
B) the blue source 
C) the yellow source 
D) They all emit the same number per second.

Question 3

The Heisenberg uncertainty principle places restriction on the precision of simultaneously measuring both position and momentum.This principle can also be applied to the simultaneous measurement of two other variables,which are

Accepted Answer

A) force and color. 
B) energy and time interval. 
C) mass and charge. 
D) torque and frequency. 
A) force and color. 
B) energy and time interval. 
C) mass and charge. 
D) torque and frequency.

Question 4

A photon absorbed by an electron will give up more energy to the electron if the photon:

Accepted Answer

A) is not spread out over many electrons. 
B) is moving faster. 
C) is moving slower. 
D) has a higher frequency. 
A) is not spread out over many electrons. 
B) is moving faster. 
C) is moving slower. 
D) has a higher frequency.

Question 5

Violet light (λ = 430 nm)is incident on a piece of potassium (φ = 2.20 eV).What is the maximum kinetic energy of the ejected photoelectrons? (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) 2.43 eV 
B) 0.69 eV 
C) 2.89 eV 
D) 5.09 eV 
E) ​0.96 eV 
A) 2.43 eV 
B) 0.69 eV 
C) 2.89 eV 
D) 5.09 eV 
E) ​0.96 eV

Question 6

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

Question 7

What is the surface temperature of a distant star (which emits light as if it were a blackbody)where the peak wavelength is 422 nm? (Hint: The surface of the human body at 35ºC has a peak wavelength of 9.41 μm).(1 nm = 10−9 m = 10-3 μm)

Accepted Answer

A) 12,900 K 
B) 13,800 K 
C) 6870 K 
D) 13,700 K 
E) ​2290 K 
A) 12,900 K 
B) 13,800 K 
C) 6870 K 
D) 13,700 K 
E) ​2290 K

Question 8

That light has a dual nature is referring to light

Accepted Answer

A) having high- or low-energy photons. 
B) acting as waves and particles. 
C) having energy and momentum. 
D) undergoing pair production. 
A) having high- or low-energy photons. 
B) acting as waves and particles. 
C) having energy and momentum. 
D) undergoing pair production.

Question 9

An electron microscope operates with electrons of kinetic energy 58 keV.What is the wavelength of these electrons? Assume this speed is not relativistic.(h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and me = 9.11 × 10−31 kg)

Accepted Answer

A) 3.57E-20 m 
B) 7.69E-13 m 
C) 5.10E-12 m 
D) 2.28E-10 m 
E) ​1.03E-11 m 
A) 3.57E-20 m 
B) 7.69E-13 m 
C) 5.10E-12 m 
D) 2.28E-10 m 
E) ​1.03E-11 m

Question 10

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. 
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.

Question 11

What is the energy of a photon whose frequency is 2.9 × 1020 Hz? (h = 6.63 × 10−34 J⋅s and 1 eV = 1.60 × 10−19 J)

Accepted Answer

A) 0.2 MeV 
B) 1.2 MeV 
C) 1.9 MeV 
D) 3.1 MeV 
E) ​0.8 MeV 
A) 0.2 MeV 
B) 1.2 MeV 
C) 1.9 MeV 
D) 3.1 MeV 
E) ​0.8 MeV

Question 12

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

Question 13

According to de Broglie,as the momentum of a moving particle is tripled,the corresponding wavelength changes by what factor?

Accepted Answer

A) 1/9 
B) 1/3 
C) 3 
D) 9 
A) 1/9 
B) 1/3 
C) 3 
D) 9

Question 14

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

Question 15

If a 1H nucleus,a 2H nucleus,and a 3H nucleus all had the same momentum,which one has the greatest de Broglie wavelength?

Accepted Answer

A) 1H 
B) 2H 
C) 3H 
D) All three have the same de Broglie wavelength. 
A) 1H 
B) 2H 
C) 3H 
D) All three have the same de Broglie wavelength.

Question 16

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

Accepted Answer

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

Question 17

What is the energy of a photon with the Compton wavelength (0.00437 nm)? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 eV = 1.60 × 10−19 J)

Accepted Answer

A) 4.55E-14 eV 
B) 2.84E+5 eV 
C) 2.84E+1 eV 
D) 3.52E-6 eV 
E) ​4.55E+5 eV 
A) 4.55E-14 eV 
B) 2.84E+5 eV 
C) 2.84E+1 eV 
D) 3.52E-6 eV 
E) ​4.55E+5 eV

Question 18

Of the following photons,which has the lowest energy?

Accepted Answer

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

Question 19

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

Question 20

For which of the following objects,each with the same kinetic energy,is the de Broglie wavelength the largest?​

Accepted Answer

A) ​car 
B) ​planet 
C) ​electron 
D) ​house fly 
A) ​car 
B) ​planet 
C) ​electron 
D) ​house fly

Exam 27: Quantum Physics

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

Sources of red,blue,and yellow light each emit light with a power of 50 mW.Which source emits more photons per second?

The Heisenberg uncertainty principle places restriction on the precision of simultaneously measuring both position and momentum.This principle can also be applied to the simultaneous measurement of two other variables,which are

A photon absorbed by an electron will give up more energy to the electron if the photon:

Violet light (λ = 430 nm)is incident on a piece of potassium (φ = 2.20 eV).What is the maximum kinetic energy of the ejected photoelectrons? (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)

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

What is the surface temperature of a distant star (which emits light as if it were a blackbody)where the peak wavelength is 422 nm? (Hint: The surface of the human body at 35ºC has a peak wavelength of 9.41 μm).(1 nm = 10−9 m = 10-3 μm)

That light has a dual nature is referring to light

An electron microscope operates with electrons of kinetic energy 58 keV.What is the wavelength of these electrons? Assume this speed is not relativistic.(h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,1 eV = 1.60 × 10−19 J,and me = 9.11 × 10−31 kg)

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

What is the energy of a photon whose frequency is 2.9 × 1020 Hz? (h = 6.63 × 10−34 J⋅s and 1 eV = 1.60 × 10−19 J)

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

According to de Broglie,as the momentum of a moving particle is tripled,the corresponding wavelength changes by what factor?

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?

If a 1H nucleus,a 2H nucleus,and a 3H nucleus all had the same momentum,which one has the greatest de Broglie wavelength?

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

What is the energy of a photon with the Compton wavelength (0.00437 nm)? (h = 6.63 × 10−34 J⋅s,c = 3.00 × 108 m/s,and 1 eV = 1.60 × 10−19 J)

Of the following photons,which has the lowest energy?

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)

For which of the following objects,each with the same kinetic energy,is the de Broglie wavelength the largest?​

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Filters

Violet light (λ = 430 nm)is incident on a piece of potassium (φ = 2.20 eV).What is the maximum kinetic energy of the ejected photoelectrons? (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 surface temperature of a distant star (which emits light as if it were a blackbody)where the peak wavelength is 422 nm? (Hint: The surface of the human body at 35ºC has a peak wavelength of 9.41 μm).(1 nm = 10−⁹ m = 10^-3 μm)

An electron microscope operates with electrons of kinetic energy 58 keV.What is the wavelength of these electrons? Assume this speed is not relativistic.(h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10−¹⁹ J,and m_e = 9.11 × 10−³¹ kg)

What is the energy of a photon whose frequency is 2.9 × 10²⁰ Hz? (h = 6.63 × 10−³⁴ J⋅s and 1 eV = 1.60 × 10−¹⁹ J)

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?

If a ¹H nucleus,a ²H nucleus,and a ³H nucleus all had the same momentum,which one has the greatest de Broglie wavelength?

What is the energy of a photon with the Compton wavelength (0.00437 nm)? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,and 1 eV = 1.60 × 10−¹⁹ J)

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)

For which of the following objects,each with the same kinetic energy,is the de Broglie wavelength the largest?