Question 1

What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV?

Accepted Answer

A) 417 nm 
B) 257 nm 
C) 344 nm 
D) 564 nm 
E) 610 nm 
A) 417 nm 
B) 257 nm 
C) 344 nm 
D) 564 nm 
E) 610 nm D

Question 2

A source of light is at a temperature of 1000°C. Its temperature is then increased to 2000°C, Increasing the temperature causes the peak intensity wavelength to

Accepted Answer

A) triple. 
B) halve. 
C) decrease but not quite halve. 
D) double. 
E) more than double. 
A) triple. 
B) halve. 
C) decrease but not quite halve. 
D) double. 
E) more than double. C

Question 3

What is the energy of a photon with a frequency of 6.60 × 1015 Hz?

Accepted Answer

A) 27.3 eV 
B) 12.3 eV 
C) 18.1 eV 
D) 19.6 eV 
E) 6.60 eV 
A) 27.3 eV 
B) 12.3 eV 
C) 18.1 eV 
D) 19.6 eV 
E) 6.60 eV A

Question 4

A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the range of frequencies in this beam of light that will be responsible for ejecting electrons from this metal surface?

Accepted Answer

A) 1.12 × 1014 Hz - 5.31 × 1014 Hz 
B) 1.12 × 1014 Hz - 3.10 × 1014 Hz 
C) 3.01 × 1014 Hz - 6.10 × 1014 Hz 
D) 5.31 × 1014 Hz - 6.10 × 1014 Hz 
E) None 
A) 1.12 × 1014 Hz - 5.31 × 1014 Hz 
B) 1.12 × 1014 Hz - 3.10 × 1014 Hz 
C) 3.01 × 1014 Hz - 6.10 × 1014 Hz 
D) 5.31 × 1014 Hz - 6.10 × 1014 Hz 
E) None

Question 5

If a surface has a work function of 1.5 eV and photons of energy 2.7 eV are shone on the surface, what is a possible kinetic energy of the electrons emitted from the surface?

Accepted Answer

A) 3.0 eV 
B) 2.0 eV 
C) 4.0 eV 
D) 1.0 eV 
E) No electrons are emitted. 
A) 3.0 eV 
B) 2.0 eV 
C) 4.0 eV 
D) 1.0 eV 
E) No electrons are emitted.

Question 6

What is the momentum of a photon of light that has a wavelength of 480 nm?

Accepted Answer

A) 1.1 × 10-27 kg∙m/s 
B) 2.2 × 10-27 kg∙m/s 
C) 1.8 × 10-27 kg∙m/s 
D) 1.4 × 10-27 kg∙m/s 
E) 2.0 × 10-27 kg∙m/s 
A) 1.1 × 10-27 kg∙m/s 
B) 2.2 × 10-27 kg∙m/s 
C) 1.8 × 10-27 kg∙m/s 
D) 1.4 × 10-27 kg∙m/s 
E) 2.0 × 10-27 kg∙m/s

Question 7

The Bohr radius of the hydrogen atom is 0.529 × 10-10 m. The radius of the n = 2 state is

Accepted Answer

A) 1.06 × 10-10 m. 
B) 2.12 × 10-10 m. 
C) 0.265 × 10-10 m. 
D) 0.529 × 10-10 m. 
E) 2.65 × 10-10 m. 
A) 1.06 × 10-10 m. 
B) 2.12 × 10-10 m. 
C) 0.265 × 10-10 m. 
D) 0.529 × 10-10 m. 
E) 2.65 × 10-10 m.

Question 8

The de Broglie wavelength is inversely proportional to the momentum of the particle.

Accepted Answer

A) True 
 B)False

Question 9

Which one of the following is correct for the energy of a 620 nm beam of light?

Accepted Answer

A) 1.60 × 10-19 eV 
B) 2.10 × 10-19 J 
C) 3.21 × 10-19 J 
D) 1.60 × 10-18 eV 
E) 3.21 × 10-18 eV 
A) 1.60 × 10-19 eV 
B) 2.10 × 10-19 J 
C) 3.21 × 10-19 J 
D) 1.60 × 10-18 eV 
E) 3.21 × 10-18 eV

Question 10

The Compton effect justifies that light acts as photons.

Accepted Answer

A) True 
 B)False

Question 11

The energy of a photon depends on

Accepted Answer

A) its amplitude. 
B) its velocity. 
C) its frequency. 
D) its mass. 
E) none of the given answers 
A) its amplitude. 
B) its velocity. 
C) its frequency. 
D) its mass. 
E) none of the given answers

Question 12

Bohr's quantum condition was

Accepted Answer

A) angular momentum is quantized. 
B) energy is exchanged when changing state. 
C) a photon is emitted as a quantum of energy 
D) electron orbits are stationary states. 
E) none of the above. 
A) angular momentum is quantized. 
B) energy is exchanged when changing state. 
C) a photon is emitted as a quantum of energy 
D) electron orbits are stationary states. 
E) none of the above.

Question 13

You perform Compton scattering experiments with X-rays of a fixed wavelength. In one experiment you scatter the X-rays from free electrons. In the second experiment you scatter the X-rays from protons instead. For X-rays scattered under a given angle, the wavelength change

Accepted Answer

A) will be larger for scattering from protons. 
B) will be the same for both cases. 
C) will be larger for scattering from electrons. 
D) depends on the actual wavelength of the X-rays. 
A) will be larger for scattering from protons. 
B) will be the same for both cases. 
C) will be larger for scattering from electrons. 
D) depends on the actual wavelength of the X-rays.

Question 14

What fraction of the total energy density in a cavity filled with black body radiation at 5000 K is in the range 5.80 × 1014 Hz and 5.85 × 1014 Hz?

Accepted Answer

A) 5% 
B) 10% 
C) 1.5% 
D) 1% 
E) 25% 
A) 5% 
B) 10% 
C) 1.5% 
D) 1% 
E) 25%

Question 15

An electron has a kinetic energy of 10 eV. What is the wavelength of this electron?

Accepted Answer

A) 5.9 × 106 m 
B) 1.2 × 10-10 m 
C) 1.9 × 106 m 
D) 3.9 × 10-10 m 
E) 3.8 × 10-6 m 
A) 5.9 × 106 m 
B) 1.2 × 10-10 m 
C) 1.9 × 106 m 
D) 3.9 × 10-10 m 
E) 3.8 × 10-6 m

Question 16

A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. The wavelength of the incident photon is 0.651 nm.
(a.) What is the wavelength of the scattered photon?
(b.) What is the energy of the scattered photon?

Accepted Answer

(a.) 0.655

Question 17

Which of the following microscopes is capable of "photographing" individual atoms?

Accepted Answer

A) light microscope 
B) scanning tunneling microscope 
C) scanning electron microscope 
D) transmission electron microscope 
E) transmission scanning microscope 
A) light microscope 
B) scanning tunneling microscope 
C) scanning electron microscope 
D) transmission electron microscope 
E) transmission scanning microscope

Question 18

A beam of X-rays at a certain wavelength are scattered from a free electron at rest and the scattered beam is observed at 45.0° to the incident beam. What is the Compton shift?

Accepted Answer

A) 1.75 × 10-13 m 
B) 2.76 × 10-13 m 
C) 0 m 
D) 3.56 × 10-13 m 
E) 7.11 × 10-13 m 
A) 1.75 × 10-13 m 
B) 2.76 × 10-13 m 
C) 0 m 
D) 3.56 × 10-13 m 
E) 7.11 × 10-13 m

Question 19

A 60-W bulb is operating at an efficiency of 6.20%. What is the number of photons per second given off by the bulb assuming the wavelength of light to be 580 nm?

Accepted Answer

A) 5.42 × 1018 photons/s 
B) 10.8 × 1018 photons/s 
C) 16.2 × 1018 photons/s 
D) 21.7 × 1018 photons/s 
E) 25.3 × 1018 photons/s 
A) 5.42 × 1018 photons/s 
B) 10.8 × 1018 photons/s 
C) 16.2 × 1018 photons/s 
D) 21.7 × 1018 photons/s 
E) 25.3 × 1018 photons/s

Question 20

What happens to the frequency of the scattered X-rays as the scattering angle in the Compton effect decreases?

Accepted Answer

A) It stays the same. 
B) It decreases. 
C) It increases. 
D) Not enough information 
A) It stays the same. 
B) It decreases. 
C) It increases. 
D) Not enough information

Exam 37: Early Quantum Theory and Models of the Atom

What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV?

A source of light is at a temperature of 1000°C. Its temperature is then increased to 2000°C, Increasing the temperature causes the peak intensity wavelength to

What is the energy of a photon with a frequency of 6.60 × 1015 Hz?

A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the range of frequencies in this beam of light that will be responsible for ejecting electrons from this metal surface?

If a surface has a work function of 1.5 eV and photons of energy 2.7 eV are shone on the surface, what is a possible kinetic energy of the electrons emitted from the surface?

What is the momentum of a photon of light that has a wavelength of 480 nm?

The Bohr radius of the hydrogen atom is 0.529 × 10-10 m. The radius of the n = 2 state is

The de Broglie wavelength is inversely proportional to the momentum of the particle.

Which one of the following is correct for the energy of a 620 nm beam of light?

The Compton effect justifies that light acts as photons.

The energy of a photon depends on

Bohr's quantum condition was

You perform Compton scattering experiments with X-rays of a fixed wavelength. In one experiment you scatter the X-rays from free electrons. In the second experiment you scatter the X-rays from protons instead. For X-rays scattered under a given angle, the wavelength change

What fraction of the total energy density in a cavity filled with black body radiation at 5000 K is in the range 5.80 × 1014 Hz and 5.85 × 1014 Hz?

An electron has a kinetic energy of 10 eV. What is the wavelength of this electron?

A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. The wavelength of the incident photon is 0.651 nm. (a.) What is the wavelength of the scattered photon? (b.) What is the energy of the scattered photon?

Which of the following microscopes is capable of "photographing" individual atoms?

A beam of X-rays at a certain wavelength are scattered from a free electron at rest and the scattered beam is observed at 45.0° to the incident beam. What is the Compton shift?

A 60-W bulb is operating at an efficiency of 6.20%. What is the number of photons per second given off by the bulb assuming the wavelength of light to be 580 nm?

What happens to the frequency of the scattered X-rays as the scattering angle in the Compton effect decreases?

Introduction, Measurement, Estimating

Describing Motion: Kinematics in One Dimension

Kinematics in Two or Three Dimensions; Vectors

Dynamics: Newtons Laws of Motion

Using Newtons Laws: Friction, Circular Motion, Drag Forces

Gravitation and Newtons6 Synthesis

Work and Energy

Conservation of Energy

Linear Momentum

Rotational Motion

Angular Momentum; General Rotation

Static Equilibrium; Elasticity and Fracture

Fluids

Oscillations

Wave Motion

Sound

Temperature, Thermal Expansion, and the Ideal Gas Law

Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance, Dielectrics, Electric Energy Storage

Electric Currents and Resistance

Dc Circuits

Magnetism

Sources of Magnetic Field

Electromagnetic Induction and Faradays Law

Inductance, Electromagnetic Oscillations, and Ac Circuits

Maxwells Equations and Electromagnetic Waves

Light: Reflection and Refraction

Lenses and Optical Instruments

The Wave Nature of Light; Interference

Diffraction and Polarization

Special Theory of Relativity

Quantum Mechanics

Quantum Mechanics of Atoms

Molecules and Solids

Nuclear Physics and Radioactivity

Nuclear Energy: Efects and Uses of Radiation

Elementary Particle

Astrophysics and Cosmology

Filters

What is the energy of a photon with a frequency of 6.60 × 10¹⁵ Hz?

A beam of light with a frequency range of 3.01 × 10¹⁴ Hz - 6.10 × 10¹⁴ Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the range of frequencies in this beam of light that will be responsible for ejecting electrons from this metal surface?

The Bohr radius of the hydrogen atom is 0.529 × 10^-10 m. The radius of the n = 2 state is

What fraction of the total energy density in a cavity filled with black body radiation at 5000 K is in the range 5.80 × 10¹⁴ Hz and 5.85 × 10¹⁴ Hz?