Physics Final Ch. 31 – Flashcards
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Which has more energy - a photon of visible light or a photon of ultraviolet light?
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a photon of ultraviolet light
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If a beam of red light and a beam of blue light have exactly the same energy, which beam contains the greater number of photons?
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a beam of red light
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The phenomenon that can be explained only in terms of the particle model of light is
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photoelectric effect
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Which of the following are conserved when a photon collides with an electron?
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momentum and energy
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In the photoelectric effect, electrons ejected from bound states in the photosensitive material have
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less kinetic energy than the absorbed photon's energy
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An electron and a proton are traveling at the same speed. Which has the longer wavelength?
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the electron
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An electron and a baseball move at the same speed. Which has the longer wavelength?
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the electron
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When the frequency of a photon is doubled, the energy it carries _______.
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doubles
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In the equation E = hf, the h is _______.
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proportionality constant
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The photoelectric effect is best stimulated by _______.
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ultraviolet light
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What exactly is ejected in the photoelectric effect?
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electrons
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When emitted, a photon behaves as a particle, and when traveling it behaves _______.
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as a wave
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The wavelength of a matter wave is inversely proportional to its _______.
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momentum
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The entity that is simultaneously uncertain in Heisenberg's uncertainty principle for momentum is _______.
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position
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According to the correspondence principle, a new theory is valid if it
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accounts for confirmed results from the old theory. predicts the same correct results as the old theory. overlaps and agrees where the old theory works
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Which of the following forms an interference pattern when directed toward two suitably spaced slits?
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electrons, light, and sound
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Two photons have the same wavelength. They also have the same
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energy and frequency
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To study the energy of photoelectrons we measure
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the potential difference required to stop them
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A photosensitive surface is illuminated with both blue and violet light. The light that will cause the most electrons to be ejected is the
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not enough information given
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In the relationship E = hf for a photon emitted from an atom, the symbol E is used to represent the energy
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of the emitted photon. difference between atomic energy states producing the photon
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According to the uncertainty principle, the more we know about a particle's momentum, the less we know about its
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location
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Quantum uncertainties are most predominant for simultaneously measuring the speed and location of
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an electron
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Which experiment best demonstrates the particle-like nature of light?
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photoelectric effect
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Light behaves primarily as a particle when it
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interacts with matter
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The ratio of a photon's energy to its frequency is
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Planck's constant
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A lump of energy associated with light is called a
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photon, quantum
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In the photoelectric effect, the greater the frequency of the illuminating light, the greater the
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maximum velocity of ejected electrons
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The photoelectric effect best demonstrates the
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particle nature of light
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Which has more energy per photon?
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blue light
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Which has less energy per photon?
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red light
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In the equation E = hf, the f stands for
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wave frequency
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The ratio of the energy of a photon to its frequency is
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Planck's constant
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Does the de Broglie wavelength of a proton become longer or shorter as its velocity increases?
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shorter
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Does the photoelectric effect depend on the wave nature or the particle nature of light?
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particle nature
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Which laser beam carries more energy per photon - a red beam or a green beam?
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green beam
