Question 1

The word LASER is an acronym for

Accepted Answer

A)  Light Amplification by the Stimulated Emission of Radiation. 
B)  Light Altered Spectra of Energy Radiated. 
C)  Light Absorbed States of Energetic Resonance. 
D)  LAtent Source of Enhanced Radiation. 
A)  Light Amplification by the Stimulated Emission of Radiation. 
B)  Light Altered Spectra of Energy Radiated. 
C)  Light Absorbed States of Energetic Resonance. 
D)  LAtent Source of Enhanced Radiation. A

Question 2

In a He-Ne laser, the actual emission line at 632.8 nm comes from a jump down in what atom(s)?

Accepted Answer

A)  helium 
B)  oxygen 
C)  hydrogen 
D)  neon 
E)  helium and neon 
A)  helium 
B)  oxygen 
C)  hydrogen 
D)  neon 
E)  helium and neon D

Question 3

If sunlight peaks at 0.55 ?m wavelength, this infers a surface temperature of the sun of how many thousand degrees Kelvin?

Accepted Answer

A)  2.5 
B)  9.5 
C)  5.3 
D)  15. 
E)  25. 
A)  2.5 
B)  9.5 
C)  5.3 
D)  15. 
E)  25. C

Question 4

How much energy is carried by a photon of wavelength 660. nm?

Accepted Answer

A)  4.78 × 10-19 eV 
B)  6.63 × 10-34 J 
C)  5.39 eV 
D)  3.01 × 10-19 J 
E)  1.46 × 10-48 J 
A)  4.78 × 10-19 eV 
B)  6.63 × 10-34 J 
C)  5.39 eV 
D)  3.01 × 10-19 J 
E)  1.46 × 10-48 J

Question 5

In order for a photon to eject an electron from a metal's surface in the photoelectric effect, the photon's

Accepted Answer

A)  momentum must be zero. 
B)  wavelength must be greater than a certain minimum value. 
C)  frequency must be greater than a certain minimum value. 
D)  speed must be greater than a certain minimum value. 
A)  momentum must be zero. 
B)  wavelength must be greater than a certain minimum value. 
C)  frequency must be greater than a certain minimum value. 
D)  speed must be greater than a certain minimum value.

Question 6

How would Bohr's theory be changed if only gravitation held the electron to the nucleus?

Accepted Answer

The force would be GmM/r² inste

Question 7

In a famous experiment done at the end of the 19th century, two metal electrodes were placed in an evacuated glass tube. A high voltage was applied between them. By using an appropriate metal for the cathode (e.g., sodium or potassium), it was found that a current could be made to flow when the cathode was illuminated with blue light, but no current would flow when red light was used, no matter how bright the light. Einstein was able to explain this strange phenomenon, and as a result, this experiment was considered the first experimental demonstration of

Accepted Answer

A)  the particle nature of electrons. 
B)  the equivalency of electron and photons. 
C)  the wave nature of light. 
D)  the particle nature of light. 
E)  the wave nature of electrons. 
A)  the particle nature of electrons. 
B)  the equivalency of electron and photons. 
C)  the wave nature of light. 
D)  the particle nature of light. 
E)  the wave nature of electrons.

Question 8

Albert Einstein received the 1921 Nobel Prize for his

Accepted Answer

A)  Special Theory of Relativity. 
B)  Theory of the Photoelectric Effect. 
C)  Theory of the Brownian Motion. 
D)  General Theory of Relativity. 
A)  Special Theory of Relativity. 
B)  Theory of the Photoelectric Effect. 
C)  Theory of the Brownian Motion. 
D)  General Theory of Relativity.

Question 9

Light from a gas discharge tube gives a (an) ________ spectrum.

Accepted Answer

A)  emission 
B)  blackbody 
C)  continuous 
D)  absorption 
A)  emission 
B)  blackbody 
C)  continuous 
D)  absorption

Question 10

What is the radius of the electron orbit in a singly ionized helium ion?

Accepted Answer

The answer of What is the radius of the electron...

Question 11

Which of Bohr's assumptions in creating the "Bohr atom" was revolutionary (unclassical)?

Accepted Answer

that angular momentum was quan

Question 12

In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in state n = 2?

Accepted Answer

A)  -1.51 eV 
B)  -6.79 eV 
C)  -4.53 eV 
D)  -5.89 eV 
E)  -3.40 eV 
A)  -1.51 eV 
B)  -6.79 eV 
C)  -4.53 eV 
D)  -5.89 eV 
E)  -3.40 eV

Question 13

________ the CUTOFF FREQUENCY, photons do not have enough energy to dislodge photoelectrons and no photocurrent is observed.

Accepted Answer

A)  Below 
B)  Above 
A)  Below 
B)  Above

Question 14

Planck's constant is

Accepted Answer

A)  6.6 × 1034 J-s. 
B)  E/$\lambda$. 
C)  4.1 × 10-15 eV-s. 
D)  6.6 × 1028 MeV-s. 
E)  4.1 × 10-15 eV-min. 
A)  6.6 × 1034 J-s. 
B)  E/$\lambda$. 
C)  4.1 × 10-15 eV-s. 
D)  6.6 × 1028 MeV-s. 
E)  4.1 × 10-15 eV-min.

Question 15

In order for the atoms in a neon discharge tube (or a neon beer sign) to emit their characteristic orange light, it is necessary that

Accepted Answer

A)  the atoms be continually replaced with fresh atoms, because the energy of the atoms tends to be used up with continued excitation, resulting in dimmer and dimmer light. 
B)  electrons first be given energy to raise them from their ground state to an excited state. 
C)  there be no unoccupied energy levels in each atom. 
D)  each atom carry a net electric charge. 
A)  the atoms be continually replaced with fresh atoms, because the energy of the atoms tends to be used up with continued excitation, resulting in dimmer and dimmer light. 
B)  electrons first be given energy to raise them from their ground state to an excited state. 
C)  there be no unoccupied energy levels in each atom. 
D)  each atom carry a net electric charge.

Question 16

What was it that the Compton effect illustrated?

Accepted Answer

Electromagnetic wave

Question 17

Photons are emitted when a bound electron jumps up to a(n) ________ energy state.

Accepted Answer

A)  zero 
B)  higher 
C)  lower 
D)  infinite 
A)  zero 
B)  higher 
C)  lower 
D)  infinite

Question 18

The fact that $\lambda$mT = 2.9 × 10-3 m-K is known as

Accepted Answer

A)  Planck's law. 
B)  Maxwell's law. 
C)  Wien's law. 
D)  Bohr's law. 
E)  de Broglie's law. 
A)  Planck's law. 
B)  Maxwell's law. 
C)  Wien's law. 
D)  Bohr's law. 
E)  de Broglie's law.

Question 19

The energy of a photon depends on

Accepted Answer

A)  its frequency. 
B)  its velocity. 
C)  its amplitude. 
A)  its frequency. 
B)  its velocity. 
C)  its amplitude.

Question 20

In the photoelectric effect, the energies of the ejected electrons

Accepted Answer

A)  vary randomly. 
B)  are proportional to the intensity of light. 
C)  are proportional to the frequency of light. 
D)  are proportional to the speed of light. 
A)  vary randomly. 
B)  are proportional to the intensity of light. 
C)  are proportional to the frequency of light. 
D)  are proportional to the speed of light.

Exam 27: Quantum Physics

The word LASER is an acronym for

In a He-Ne laser, the actual emission line at 632.8 nm comes from a jump down in what atom(s)?

If sunlight peaks at 0.55 ?m wavelength, this infers a surface temperature of the sun of how many thousand degrees Kelvin?

How much energy is carried by a photon of wavelength 660. nm?

In order for a photon to eject an electron from a metal's surface in the photoelectric effect, the photon's

How would Bohr's theory be changed if only gravitation held the electron to the nucleus?

Albert Einstein received the 1921 Nobel Prize for his

Light from a gas discharge tube gives a (an) ________ spectrum.

What is the radius of the electron orbit in a singly ionized helium ion?

Which of Bohr's assumptions in creating the "Bohr atom" was revolutionary (unclassical)?

In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in state n = 2?

________ the CUTOFF FREQUENCY, photons do not have enough energy to dislodge photoelectrons and no photocurrent is observed.

Planck's constant is

In order for the atoms in a neon discharge tube (or a neon beer sign) to emit their characteristic orange light, it is necessary that

What was it that the Compton effect illustrated?

Photons are emitted when a bound electron jumps up to a(n) ________ energy state.

The fact that λ\lambdaλ mT = 2.9 × 10-3 m-K is known as

The energy of a photon depends on

In the photoelectric effect, the energies of the ejected electrons

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

The fact that $\lambda$ _mT = 2.9 × 10^-3 m-K is known as