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Q4: A Doppler effect occurs when a source
Q13: Light behaves primarily as a wave when
Q31: A positive charge and a negative charge
Q35: In a longitudinal wave the compressions and
Q45: In a common dc circuit,electrons move at
Q48: An object that completes 20 vibrations in
Q49: A chain reaction grows when the average
Q57: Compared to protons,the reason neutrons are effective
Q59: When a pulse of white light is
Q63: The refraction of light in a diamond