Question 1

Atoms can be excited by

Accepted Answer

A)   photon impact.
B)   electron impact.
C)   thermal agitation.
D)   all of these
E)   none of these

Question 2

An atom that absorbs a photon of a certain energy can then emit

Accepted Answer

A)   only a photon of the same or higher energy.
B)   a photon of any energy.
C)   only a photon of that energy.
D)   only a photon of the same or lower energy.

Question 3

Light frequency from an incandescent lamp depends on the

Accepted Answer

A)   transparency of glass.
B)   voltage applied to the lamp.
C)   electrical resistance of the lamp.
D)   amount of electrical energy transformed.
E)   rate of atomic and molecular vibrations.

Question 4

Which color of light carries the most energy per photon?

Accepted Answer

A)   red
B)   violet
C)   blue
D)   green
E)   all the same

Question 5

If atoms were smaller, Planck's constant would be

Accepted Answer

A)   larger.
B)   smaller.
C)   no different in physical size.

Question 6

Light behaves primarily as a wave when it

Accepted Answer

A)   interacts with matter.
B)   travels from one place to another.

Question 7

A new theory conforms to the correspondence principle when it

Accepted Answer

A)   corresponds to all theories in nature.
B)   accounts for verified results of the old theory.
C)   ties two or more theories together.
D)   updates the essence of the old theory.
E)   none of these

Question 8

Light is emitted when an electron

Accepted Answer

A)   makes a transition to a lower energy level.
B)   is boosted to a higher energy level.
C)   neither of these

Question 9

Astronomers can tell whether a star is approaching or receding from earth by

Accepted Answer

A)   the Doppler effect.
B)   its temperature.
C)   its change in temperature.
D)   its absorption spectra.
E)   all of these

Question 10

Which experiment best demonstrates the particle-like nature of light?

Accepted Answer

A)   double-slit experiment
B)   photoelectric effect
C)   neither

Question 11

Compared to the energy of a photon of red light, the energy of a photon of blue light is

Accepted Answer

A)   less.
B)   more.
C)   the same.

Question 12

In the Bohr model of hydrogen, discrete radii and energy states result when an electron circles the atom in an integral number of

Accepted Answer

A)   diffraction patterns.
B)   de Broglie wavelengths.
C)   wave frequencies.
D)   none of these

Question 13

The main reason electrons occupy discrete orbits in an atom is because

Accepted Answer

A)   electric forces act over quantized distances.
B)   energy levels are quantized.
C)   electrons are basically discrete particles.
D)   the circumference of each orbit is an integral multiple of electron wavelengths.
E)   none of these

Question 14

Which of the following is not quantized?

Accepted Answer

A)   energy
B)   electric charge
C)   radiation
D)   number of people in a room
E)   All are quantized.

Question 15

Helium was first discovered in the

Accepted Answer

A)   upper atmosphere.
B)   island of Helios, in Greece.
C)   byproducts of nuclear fusion.
D)   sun.
E)   laboratory.

Question 16

In the double-slit experiment with electrons, the electrons arrive at the screen in a

Accepted Answer

A)   particle-like way with a pattern that is wave-like.
B)   particle-like way with a pattern that is particle-like.
C)   wave-like way with a pattern that is particle-like.
D)   wave-like way with a pattern that is wave-like.

Question 17

In the photoelectric effect, the brighter the illuminating light on a photosensitive surface, the greater the

Accepted Answer

A)   number of ejected electrons.
B)   velocity of ejected electrons.
C)   both of these
D)   neither of these

Question 18

Two beams of light, a red beam and a blue beam, have the same energy. The beam with the greater number of photons is the

Accepted Answer

A)   blue beam.
B)   red beam.
C)   both the same

Question 19

A lump of energy associated with light is called a

Accepted Answer

A)   photon.
B)   quantum.
C)   both of these
D)   neither of these

Question 20

A photosensitive surface is illuminated with both blue and violet light. The light that will cause the most electrons to be ejected is the

Accepted Answer

A)   violet light.
B)   blue light.
C)   Both eject the same number.
D)   not enough information given

Exam 15: Quantum Theory

Light behaves primarily as a wave when it

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An atom that absorbs a photon of a certain energy can then emit

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Two beams of light, a red beam and a blue beam, have the same energy. The beam with the greater number of photons is the

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Which of the following is not quantized?

Correct AnswerverifiedShow Answer

In the double-slit experiment with electrons, the electrons arrive at the screen in a

Correct AnswerverifiedShow Answer

Light frequency from an incandescent lamp depends on the

Correct AnswerverifiedShow Answer

Astronomers can tell whether a star is approaching or receding from earth by

Correct AnswerverifiedShow Answer

Compared to the energy of a photon of red light, the energy of a photon of blue light is

Correct AnswerverifiedShow Answer

In the Bohr model of hydrogen, discrete radii and energy states result when an electron circles the atom in an integral number of

Correct AnswerverifiedShow Answer

A photosensitive surface is illuminated with both blue and violet light. The light that will cause the most electrons to be ejected is the

Correct AnswerverifiedShow Answer

A lump of energy associated with light is called a

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The main reason electrons occupy discrete orbits in an atom is because

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Which color of light carries the most energy per photon?

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A new theory conforms to the correspondence principle when it

Correct AnswerverifiedShow Answer

If atoms were smaller, Planck's constant would be

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Atoms can be excited by

Correct AnswerverifiedShow Answer

Light is emitted when an electron

Correct AnswerverifiedShow Answer

In the photoelectric effect, the brighter the illuminating light on a photosensitive surface, the greater the

Correct AnswerverifiedShow Answer

Helium was first discovered in the

Correct AnswerverifiedShow Answer

Which experiment best demonstrates the particle-like nature of light?

Correct AnswerverifiedShow Answer

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