Frequency is the number of waves that pass a fixed point in a given amount of time. The frequency is only affected by the source of the wave.
When light travels from air into water,
A. its velocity changes, but its frequency and wavelength do not change.
B. its frequency changes, but its velocity and wavelength do not change.
C. its velocity and wavelength change, but its frequency does not change.
D. its wavelength changes, but its velocity and frequency do not change.
E. its velocity, wavelength, frequency all change.
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What scientific concept do you need to know in order to solve this problem?
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