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Chapter 31. Light Quanta. A quantum of light is called a. proton. photon. phonon. None of the above. A quantum of light is called a. proton. photon. phonon. None of the above. Which of these are quantized?. Electrons Photons Electric charge All of these.

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## Chapter 31

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**Chapter 31**Light Quanta**A quantum of light is called a**• proton. • photon. • phonon. • None of the above.**A quantum of light is called a**• proton. • photon. • phonon. • None of the above.**Which of these are quantized?**• Electrons • Photons • Electric charge • All of these.**Which of these are quantized?**• Electrons • Photons • Electric charge • All of these.**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.**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.**The ratio of a photon’s energy to its frequency is**• its speed. • its wavelength. • its amplitude. • Planck’s constant.**The ratio of a photon’s energy to its frequency is**• its speed. • its wavelength. • its amplitude. • Planck’s constant.**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.**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.**The photoelectric effect occurs when light that hits a**surface ejects • photons. • electrons. • Both of these. • None of these.**The photoelectric effect occurs when light that hits a**surface ejects • photons. • electrons. • Both of these. • None of these. 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.**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.**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.**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.**The photoelectric effects supports the view that light is**composed of • waves. • particles. • Both of these. • None of these.**The photoelectric effects supports the view that light is**composed of • waves. • particles. • Both of these. • None of these.**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.**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.**The momentum of light is related to its**• wavelength. • speed. • mass. • All of these.**The momentum of light is related to its**• wavelength. • speed. • mass. • All of these.**The wavelength of a matter wave is**• directly proportional to its momentum. • inversely proportional to its momentum. • theoretical only. • related to π.**The wavelength of a matter wave is**• directly proportional to its momentum. • inversely proportional to its momentum. • theoretical only. • related to π.**The wavelength of an electron beam is of practical use in**• a centrifuge. • an electron microscope. • electron and optical microscopes alike. • powerful magnifying glasses.**The wavelength of an electron beam is of practical use in**• a centrifuge. • an electron microscope. • electron and optical microscopes alike. • powerful magnifying glasses.**The wavelengths of typical electron beams are**• longer than wavelengths of light. • shorter than wavelengths of light. • nonexistent. • practical in ultrasound technology.**The wavelengths of typical electron beams are**• longer than wavelengths of light. • shorter than wavelengths of light. • nonexistent. • practical in ultrasound technology.**Electron beams can undergo**• diffraction. • interference. • Both of these. • None of these.**Electron beams can undergo**• diffraction. • interference. • Both of these. • None of these.**Quantum uncertainties are relevant when trying to**simultaneously measure the speed and location of • a baseball. • a spitball. • an electron. • All of these.**Quantum uncertainties are relevant when trying to**simultaneously measure the speed and location of • a baseball. • a spitball. • an electron. • All of these.**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.**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.**Subatomic interactions described by quantum mechanics are**governed by • laws of certainty. • laws of probability. • exact measurements. • All of these.**Subatomic interactions described by quantum mechanics are**governed by • laws of certainty. • laws of probability. • exact measurements. • All of these.**In the quantum microworld, predictability depends on**• having exact measurements. • knowledge of initial conditions. • pure chance and luck. • chaos.**In the quantum microworld, predictability depends on**• having exact measurements. • knowledge of initial conditions. • pure chance and luck. • chaos.**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.**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.

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