A certain type of laser emits light that has a frequency of, Ask an Expert

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A certain type of laser emits light that has a frequency of 5.2x10¹⁴Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.7x 10^-11 s.

a) How many wavelengths are there in one pulse?

b) the light enters a pool of water, the frequency of the light remains the same, but the speed of the light slows down to 2.3x 10⁸m/s. How many wavelengths are there now in one pulse?

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