Ch 31: Physics Flashcards
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Which has more energy per photon?
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blue light
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In the equation E = hf, the symbol E stands for
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energy.
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In the equation E = hf, the symbol f stands for
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wave frequency.
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The physics underlying photovoltaic solar cells is
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the photoelectric effect.
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When ejected electrons from a photosensitive surface are confined within the material we have a
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photovoltaic cell.
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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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Light behaves primarily as a wave when it
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travels from one place to another.
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A bullet and a proton have the same momentum. Which has the longer wavelength?
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both the same
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An electron microscope makes use of
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the wave nature of electrons.
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Heisenberg's uncertainty principle is noticeable only for submicroscopic particles. predominant in the atomic domain. a fundamental principle in quantum mechanics.
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all of the above
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In Heisenberg's formula, △p △x≥ h, the △ symbolizes
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uncertainty of.
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According to your textbook, popular confusion is lessened when applying Heisenberg's uncertainty principle by heeding the distinction between
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passive observation and probing
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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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According to the principle of complementarity, wavelike and particle-like properties of light
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make up a wholeness that better describes nature.
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The first to be credited with the idea that energy was quantized was
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Max Planck.
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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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In photoelectric emission, the work function is the minimum
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energy required to eject an electron from the surface.
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The photoelectric effect supports a
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particle nature of light.
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Very low-intensity light passing through a double slit produces a pattern that
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is built up one photon at a time.
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Two photons that have the same wavelength also have the same frequency. energy.
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both of these
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The wavelength of a particle relates to its
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momentum.
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Heisenberg's uncertainty principle applies to energy and time. momentum and position.
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both of these
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The Heisenberg uncertainty principle states that we can't simultaneously measure exactly both the position and momentum of a particle. Planck's constant sets a limit on accuracy of measurements. we can't simultaneously measure exactly a particle's energy and time having that energy.
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all of the above
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In placing a cool thermometer into a hot cup of tea you likely are affecting its temperature. draining energy from the tea. both of these
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both of these
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According to Heisenberg's 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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The photons having least energy are those of
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infrared.
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A lump of energy associated with light is called a photon. quantum.
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both of these
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If we increase the brightness of violet light shining on a photosensitive surface we also increases the
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number of electrons ejected per second.
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Which experiment best illustrates 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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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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Which can undergo diffraction?
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all of the above
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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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In Heisenberg's formula, △p △x≥ h, the h symbolizes
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Planck's constant divided by 2π.
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Heisenberg's uncertainty principle is noticeable only for submicroscopic particles. predominant in the atomic domain. a fundamental principle in quantum mechanics.
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all of the above
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The first to be credited with the idea that light is quantized was
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Albert Einstein.
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Taking the work function into account, electrons ejected from a photosensitive material have
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less kinetic energy than the absorbed photon's energy.
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In the photoelectric effect, the brighter the illuminating light on a photosensitive surface, the greater the
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number of ejected electrons.
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Which produces an interference pattern when directed through two suitably spaced slits?
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all of the above
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The more we know about a particle's position, the less we know about its
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all of the above
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In casually observing a cup of tea you are
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neither of these
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A quantum of light is called
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none of the above
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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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Which of the following is quantized?
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all of the above
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The wave-particle duality applies to
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all of the above
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What is conserved when a photon collides with an electron?
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both of these
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If a proton and an electron have the same momentum, the longer wavelength belongs to the
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both the same
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By adjusting a TV image with a remote you can
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affect only the image.
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At the beach you see a friend facing away from you. Keeping quiet you can cause her to turn around by
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tossing small pebbles at her back.
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The Heisenberg uncertainty principle states that
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all of the above
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Two pulses of light, one red and one blue, have the same energy. The pulse with the greater number of photons is the
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red pulse.
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The phenomenon easily explained only in terms of the particle model of light is
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photoelectric effect.
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Two photons that have the same wavelength also have the same
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both of these
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When you adjust a telescope to get a clear image of Saturn's rings, in a small but measurable way you alte
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the telescope.
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When Niels Bohr was knighted for his contributions to physics, he chose for his coat of arms
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the yin-yang symbol of Eastern culture.
