# Chapter 31 Light Quanta.

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Chapter 31 Light Quanta

A quantum of light is called a
proton. photon. phonon. None of the above. Answer: B

A quantum of light is called a
proton. photon. phonon. None of the above. Answer: B

Which of these are quantized?
Electrons Photons Electric charge All of these. Answer: D

Which of these are quantized?
Electrons Photons Electric charge All of these. Answer: D

In the field of physics, a quantum
is a fundamental unit in nature. is sometimes composed of subparts. can vary with extreme conditions. All of these. Answer: A

In the field of physics, a quantum
is a fundamental unit in nature. is sometimes composed of subparts. can vary with extreme conditions. All of these. Answer: A

The ratio of a photon’s energy to its frequency is
its speed. its wavelength. its amplitude. Planck’s constant. Answer: D

The ratio of a photon’s energy to its frequency is
its speed. its wavelength. its amplitude. Planck’s constant. Answer: D

Planck’s constant h is a proportionality constant similar to the more familiar constant p. the ratio of energy per frequency for a photon. a basic constant of nature. All of these. Answer: D

Planck’s constant h is a proportionality constant similar to the more familiar constant p. the ratio of energy per frequency for a photon. a basic constant of nature. All of these. Answer: D

The photoelectric effect occurs when light that hits a surface ejects
photons. electrons. Both of these. None of these. Answer: B

The photoelectric effect occurs when light that hits a surface ejects
photons. electrons. Both of these. None of these. Answer: B Comment: Don’t confuse the ejection of electrons with the emission of photons.

During the photoelectric effect, brighter light causes the emission of
more electrons. more energetic electrons. ultraviolet light. a higher work function in the metal surface. Answer: A

During the photoelectric effect, brighter light causes the emission of
more electrons. more energetic electrons. ultraviolet light. a higher work function in the metal surface. Answer: A

The kinetic energy of electrons ejected during the photoelectric effect depends on the
brightness of illuminating light. frequency of illuminating light. speed of illuminating light. sensitivity of the surface. Answer: B

The kinetic energy of electrons ejected during the photoelectric effect depends on the
brightness of illuminating light. frequency of illuminating light. speed of illuminating light. sensitivity of the surface. Answer: B

The photoelectric effects supports the view that light is composed of
waves. particles. Both of these. None of these. Answer: B

The photoelectric effects supports the view that light is composed of
waves. particles. Both of these. None of these. Answer: B

Which of these best illustrates the dual nature of light?
Light travels as a wave and hits like a particle. Light travels as a particle and hits like a wave. Both of these say much the same thing. None of these. Answer: A

Which of these best illustrates the dual nature of light?
Light travels as a wave and hits like a particle. Light travels as a particle and hits like a wave. Both of these say much the same thing. None of these. Answer: A

The momentum of light is related to its
wavelength. speed. mass. All of these. Answer: A

The momentum of light is related to its
wavelength. speed. mass. All of these. Answer: A

The wavelength of a matter wave is
directly proportional to its momentum. inversely proportional to its momentum. theoretical only. related to π. Answer: B

The wavelength of a matter wave is
directly proportional to its momentum. inversely proportional to its momentum. theoretical only. related to π. Answer: B

The wavelength of an electron beam is of practical use in
a centrifuge. an electron microscope. electron and optical microscopes alike. powerful magnifying glasses. Answer: B

The wavelength of an electron beam is of practical use in
a centrifuge. an electron microscope. electron and optical microscopes alike. powerful magnifying glasses. Answer: B

The wavelengths of typical electron beams are
longer than wavelengths of light. shorter than wavelengths of light. nonexistent. practical in ultrasound technology. Answer: B

The wavelengths of typical electron beams are
longer than wavelengths of light. shorter than wavelengths of light. nonexistent. practical in ultrasound technology. Answer: B

Electron beams can undergo
diffraction. interference. Both of these. None of these. Answer: C

Electron beams can undergo
diffraction. interference. Both of these. None of these. Answer: C

Quantum uncertainties are relevant when trying to simultaneously measure the speed and location of
a baseball. a spitball. an electron. All of these. Answer: C

Quantum uncertainties are relevant when trying to simultaneously measure the speed and location of
a baseball. a spitball. an electron. All of these. Answer: C

According to the uncertainty principle, the more we know about a particle’s momentum, the less we know about its kinetic energy. mass. location. speed. Answer: C

According to the uncertainty principle, the more we know about a particle’s momentum, the less we know about its kinetic energy. mass. location. speed. Answer: C

Subatomic interactions described by quantum mechanics are governed by
laws of certainty. laws of probability. exact measurements. All of these. Answer: B

Subatomic interactions described by quantum mechanics are governed by
laws of certainty. laws of probability. exact measurements. All of these. Answer: B

In the quantum microworld, predictability depends on
having exact measurements. knowledge of initial conditions. pure chance and luck. chaos. Answer: B

In the quantum microworld, predictability depends on
having exact measurements. knowledge of initial conditions. pure chance and luck. chaos. Answer: B

A feature of chaotic systems is that small changes in initial conditions
lead to small differences later. lead to big differences later. may lead to big differences later. have little or no relation to small or big differences later. Answer: C

A feature of chaotic systems is that small changes in initial conditions
lead to small differences later. lead to big differences later. may lead to big differences later. have little or no relation to small or big differences later. Answer: C

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