Question 1

In the Compton effect, as the scattering angle increases, the frequency of the X-rays scattered at that angle

Accepted Answer

A)  varies randomly. 
B)  decreases. 
C)  does not change. 
D)  increases. 
A)  varies randomly. 
B)  decreases. 
C)  does not change. 
D)  increases.

Question 2

Give an example of a material whose useful property depends upon a metastable state.

Accepted Answer

phosphores

Question 3

The compact disc stores information by means of

Accepted Answer

A)  Compton scattering. 
B)  stimulated absorption. 
C)  pits and lands. 
D)  the photoelectric effect. 
E)  holography. 
A)  Compton scattering. 
B)  stimulated absorption. 
C)  pits and lands. 
D)  the photoelectric effect. 
E)  holography.

Question 4

The graph shown in Figure 27-1 is a plot based on student data from their testing of a
photoelectric material.
 
 (a) Determine the cutoff frequency.
(b) Determine the work function.

Accepted Answer

(a) 25. × 10<sup>13<

Question 5

The ratio of energy to frequency for a given photon gives

Accepted Answer

A)  its work function. 
B)  Planck's constant. 
C)  its velocity. 
D)  its amplitude. 
A)  its work function. 
B)  Planck's constant. 
C)  its velocity. 
D)  its amplitude.

Question 6

When the accelerating voltage in an X-ray tube is doubled, the minimum wavelength of the X-rays

Accepted Answer

A)  is decreased to one-fourth the original value. 
B)  is decreased to one-half the original value. 
C)  is increased to four times the original value. 
D)  is increased to twice the original value. 
A)  is decreased to one-fourth the original value. 
B)  is decreased to one-half the original value. 
C)  is increased to four times the original value. 
D)  is increased to twice the original value.

Question 7

Bohr's atomic theory predicted energy levels for hydrogen of En = -(2 π2k2e4m) about a bare nucleus of atomic number Z, how do you expect Z to be incorporated into the En formula and why?

Accepted Answer

The attractive force is k(Ze)e

Question 8

What is the ionization energy for a doubly ionized lithium ion (Z = 3)?

Accepted Answer

The answer of What is the ionization energy for a...

Question 9

Classical theory predicts that the planets can orbit the Sun quite stably. Why could not stable orbits be predicted for the atom by simply substituting the electrical attraction for the gravitational attraction? Why was there a classical crisis in describing the atom?

Accepted Answer

An electron, classically orbiting the nu

Question 10

You may have heard it said that all objects, even ones at the temperature of our bodies, are continually emitting electromagnetic radiation. Is this true?

Accepted Answer

A)  Yes, and the radiation from our bodies is mostly in the infrared region of the spectrum, and hence not detected by our eyes. 
B)  Yes, and this radiation is mostly in the form of radio waves, which is a common source of static often heard on an AM radio. 
C)  No, this is not true. If a person were emitting electromagnetic radiation, he could be seen glowing in the dark, and this is obviously not the case for most people. 
D)  Yes, and the radiation referred to results from the trace amounts of radioactive material that have accumulated in our bodies from the food we eat. 
A)  Yes, and the radiation from our bodies is mostly in the infrared region of the spectrum, and hence not detected by our eyes. 
B)  Yes, and this radiation is mostly in the form of radio waves, which is a common source of static often heard on an AM radio. 
C)  No, this is not true. If a person were emitting electromagnetic radiation, he could be seen glowing in the dark, and this is obviously not the case for most people. 
D)  Yes, and the radiation referred to results from the trace amounts of radioactive material that have accumulated in our bodies from the food we eat.

Question 11

Which hydrogen spectral series falls in the visible region?

Accepted Answer

A)  Lyman 
B)  Paschen 
C)  Balmer 
D)  Brackett 
A)  Lyman 
B)  Paschen 
C)  Balmer 
D)  Brackett

Question 12

In the photoelectric effect, the stopping potential is

Accepted Answer

A)  e Kmax. 
B)  (Kmax)/e -  . 
C)  Kmax /e. 
D)   . 
E)  Kmax. 
A)  e Kmax. 
B)  (Kmax)/e -  . 
C)  Kmax /e. 
D)   . 
E)  Kmax.

Question 13

In the Bohr theory the orbital radius depends upon the principal quantum number in what way?

Accepted Answer

A)  n3 
B)  n 
C)  1/n 
D)  n2 
E)  1/n2 
A)  n3 
B)  n 
C)  1/n 
D)  n2 
E)  1/n2

Question 14

When an electron jumps from an orbit where n = 4 to one where n = 3

Accepted Answer

A)  two photons are emitted. 
B)  a photon is emitted. 
C)  a photon is absorbed. 
D)  two photons are absorbed. 
A)  two photons are emitted. 
B)  a photon is emitted. 
C)  a photon is absorbed. 
D)  two photons are absorbed.

Question 15

Planck's constant

Accepted Answer

A)  sets an upper limit to the amount of energy that can be absorbed or emitted. 
B)  sets a lower limit to the amount of energy that can be absorbed or emitted. 
C)  determines the value of the gravitational constant. 
D)  relates mass to energy. 
A)  sets an upper limit to the amount of energy that can be absorbed or emitted. 
B)  sets a lower limit to the amount of energy that can be absorbed or emitted. 
C)  determines the value of the gravitational constant. 
D)  relates mass to energy.

Question 16

What are the two basic conditions necessary for laser action?

Accepted Answer

population

Question 17

Consider an atom with four accessible energy levels. What is the maximum number of different wavelengths that could be emitted by such an atom?

Accepted Answer

A)  5 
B)  8 
C)  4 
D)  6 
E)  7 
A)  5 
B)  8 
C)  4 
D)  6 
E)  7

Question 18

Which color of light has the lowest energy photons?

Accepted Answer

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

Question 19

In a Compton scattering experiment, what scattering angle produces the greatest change in wavelength?

Accepted Answer

A)  45.° 
B)  180.° 
C)  zero degrees 
D)  90.° 
E)  270.° 
A)  45.° 
B)  180.° 
C)  zero degrees 
D)  90.° 
E)  270.°

Question 20

The Compton effect importantly demonstrated which property of electromagnetic radiation?

Accepted Answer

A)  momenta 
B)  its wavelength 
C)  particle nature 
D)  energy content 
A)  momenta 
B)  its wavelength 
C)  particle nature 
D)  energy content

Exam 27: Quantum Physics

In the Compton effect, as the scattering angle increases, the frequency of the X-rays scattered at that angle

Give an example of a material whose useful property depends upon a metastable state.

The compact disc stores information by means of

The graph shown in Figure 27-1 is a plot based on student data from their testing of a photoelectric material. (a) Determine the cutoff frequency. (b) Determine the work function.

The ratio of energy to frequency for a given photon gives

When the accelerating voltage in an X-ray tube is doubled, the minimum wavelength of the X-rays

Bohr's atomic theory predicted energy levels for hydrogen of En = -(2 π2k2e4m) about a bare nucleus of atomic number Z, how do you expect Z to be incorporated into the En formula and why?

What is the ionization energy for a doubly ionized lithium ion (Z = 3)?

Classical theory predicts that the planets can orbit the Sun quite stably. Why could not stable orbits be predicted for the atom by simply substituting the electrical attraction for the gravitational attraction? Why was there a classical crisis in describing the atom?

You may have heard it said that all objects, even ones at the temperature of our bodies, are continually emitting electromagnetic radiation. Is this true?

Which hydrogen spectral series falls in the visible region?

In the photoelectric effect, the stopping potential is

In the Bohr theory the orbital radius depends upon the principal quantum number in what way?

When an electron jumps from an orbit where n = 4 to one where n = 3

Planck's constant

What are the two basic conditions necessary for laser action?

Consider an atom with four accessible energy levels. What is the maximum number of different wavelengths that could be emitted by such an atom?

Which color of light has the lowest energy photons?

In a Compton scattering experiment, what scattering angle produces the greatest change in wavelength?

The Compton effect importantly demonstrated which property of electromagnetic radiation?

Measurement and Problem Solving

Kinematics: Description of Motion

Motion in Two Dimensions

Force and Motion

Work and Energy

Linear Momentum and Collisions

Circular Motion and Gravitation

Rotational Motion and Equilibrium

Solids and Fluids

Temperature and Kinetic Theory

Heat

Thermodynamics

Vibrations and Waves

Sound

Electric Charge, Forces, and Fields

Electric Potential, Energy, and Capacitance

Electric Current and Resistance

Basic Electric Circuits

Magnetism

Electromagnetic Induction and Waves

AC Circuits

Reflection and Refraction of Light

Mirrors and Lenses

Physical Optics: The Wave Nature of Light

Vision and Optical Instruments

Relativity

Quantum Mechanics and Atomic Physics

The Nucleus

Nuclear Reactions and Elementary Particles

Filters

Bohr's atomic theory predicted energy levels for hydrogen of E_n = -(2 π²k²e⁴m) about a bare nucleus of atomic number Z, how do you expect Z to be incorporated into the E_n formula and why?