Question 1

If a blackbody is at 2650° C,what will be the peak wavelength emitted? Wien's displacement constant  
)

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

Planck's quantum theory is compatible with the experimental data related to which of the following?

Accepted Answer

A)  blackbody radiation 
B)  the photoelectric effect 
C)  line spectra emitted by hydrogen gas 
D)  all of the above 
A)  blackbody radiation 
B)  the photoelectric effect 
C)  line spectra emitted by hydrogen gas 
D)  all of the above

Question 3

The "seeing" ability or resolution of radiation is determined by its wavelength.If the size of an atom is approximately 1.3 × 10−10 m,how fast must an electron travel to have a wavelength smaller than that of an atom? (me = 9.11 × 10−31 kg and h = 6.63 × 10−34 J⋅s)

Accepted Answer

A)  5.6E+6 m/s 
B)  5.1E+7 m/s 
C)  8.4E+5 m/s 
D)  9.5E+6 m/s 
E)  ​2.4E+3 m/s 
A)  5.6E+6 m/s 
B)  5.1E+7 m/s 
C)  8.4E+5 m/s 
D)  9.5E+6 m/s 
E)  ​2.4E+3 m/s

Question 4

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 5

What is the surface temperature of a distant star (which emits light as if it were a blackbody)where the peak wavelength is 474 nm? (Hint: The surface of the human body at 35° C has a peak wavelength of 9.41 μm).(1 nm = 10−9 m = 10-3 μm)

Accepted Answer

A)  14,500 K 
B)  15,500 K 
C)  6120 K 
D)  12,200 K 
E)  ​2040 K 
A)  14,500 K 
B)  15,500 K 
C)  6120 K 
D)  12,200 K 
E)  ​2040 K

Question 6

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 7

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 8

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 9

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 10

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 11

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 12

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 13

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 14

According to Wien's displacement law,if the absolute temperature of a radiating blackbody is tripled,then the peak wavelength emitted will change by what factor?

Accepted Answer

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

Question 15

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 16

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

Question 17

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 18

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 19

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 20

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.

Exam 27: Quantum Physics Blackbody Radiation and Plancks Hypothesis

If a blackbody is at 2650° C,what will be the peak wavelength emitted? Wien's displacement constant )

Planck's quantum theory is compatible with the experimental data related to which of the following?

The "seeing" ability or resolution of radiation is determined by its wavelength.If the size of an atom is approximately 1.3 × 10−10 m,how fast must an electron travel to have a wavelength smaller than that of an atom? (me = 9.11 × 10−31 kg and h = 6.63 × 10−34 J⋅s)

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

What is the surface temperature of a distant star (which emits light as if it were a blackbody)where the peak wavelength is 474 nm? (Hint: The surface of the human body at 35° C has a peak wavelength of 9.41 μm).(1 nm = 10−9 m = 10-3 μm)

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

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)

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 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:

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

That light has a dual nature is referring to light:

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)

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 Wien's displacement law,if the absolute temperature of a radiating blackbody is tripled,then the peak wavelength emitted will change by what factor?

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

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

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)

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

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

The "seeing" ability or resolution of radiation is determined by its wavelength.If the size of an atom is approximately 1.3 × 10−¹⁰ m,how fast must an electron travel to have a wavelength smaller than that of an atom? (m_e = 9.11 × 10−³¹ kg and h = 6.63 × 10−³⁴ J⋅s)

What is the surface temperature of a distant star (which emits light as if it were a blackbody)where the peak wavelength is 474 nm? (Hint: The surface of the human body at 35^° C has a peak wavelength of 9.41 μm).(1 nm = 10−⁹ m = 10^-3 μm)

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)

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)

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)

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)

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)

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