PHYS 284 CH.5 questions with answers

PHYS 284 CH.5 questions with answers
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1) If you have a 100-watt light bulb, how much energy
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does it use each minute?
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A) 6,000 joules
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B) 6,000 watts
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C) 600 joules
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D) 600 watts
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E) 100 joules - CORRECT ANSWERS ✔✔Answer: A
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2) If a material is highly opaque, then it
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A) reflects most light.
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B) absorbs most light.
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C) transmits most light.
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D) scatters most light.
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E) emits most light. - CORRECT ANSWERS ✔✔Answer: B
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3) When light reflects off an object, what is the relation
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between the angle of incidence and the angle of
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reflection? |\




A) angle of incidence = angle of reflection
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B) angle of incidence + angle of reflection = 90°
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,C) angle of incidence + angle of reflection = 180°
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D) angle of incidence - angle of reflection = 90°
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E) It depends on the material that the light reflects off. -
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CORRECT ANSWERS ✔✔Answer: A
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4) If a material is transparent, then it
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A) reflects light well.
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B) absorbs light well.
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C) transmits light well.
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D) scatters light well.
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E) emits light well. - CORRECT ANSWERS ✔✔Answer: C
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5) Grass (that is healthy) looks green because
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A) it emits green light and absorbs other colors.
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B) it absorbs green light and emits other colors.
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C) it transmits green light and emits other colors.
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D) it reflects green light and absorbs other colors. -
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CORRECT ANSWERS ✔✔Answer: D
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,6) Everything looks red through a red filter because
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A) the filter emits red light and absorbs other colors.
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B) the filter absorbs red light and emits other colors.
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C) the filter transmits red light and absorbs other colors.
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D) the filter reflects red light and transmits other colors. -
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CORRECT ANSWERS ✔✔Answer: C |\ |\ |\




7) Which of the following cannot be described by a field?
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A) gravitational forces
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B) electrical forces
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C) magnetic forces
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D) radiation pressure - CORRECT ANSWERS ✔✔Answer: D
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8) The frequency of a wave is
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A) the number of peaks passing by any point each
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second. |\




B) measured in cycles per second.
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C) measured in hertz (Hz).
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D) equal to the speed of the wave divided by the
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wavelength of the wave. |\ |\ |\ |\




E) all of the above - CORRECT ANSWERS ✔✔Answer: E
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9) The wavelength of a wave is
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, A) how strong the wave is.
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B) the distance between a peak of the wave and the next
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trough. |\




C) the distance between two adjacent peaks of the wave.
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D) the distance between where the wave is emitted and
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where it is absorbed.|\ |\ |\ |\




E) equal to the speed of the wave times the wave's
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frequency. - CORRECT ANSWERS ✔✔Answer: C |\ |\ |\ |\ |\




10) How are wavelength, frequency, and energy related
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for photons of light?
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A) Longer wavelength means lower frequency and lower
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energy. |\




B) Longer wavelength means higher frequency and lower
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energy. |\




C) Longer wavelength means higher frequency and higher
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energy.
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D) Longer wavelength means lower frequency and higher
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energy. |\




E) There is no simple relationship because different
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photons travel at different speeds. - CORRECT ANSWERS
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✔✔Answer: A |\