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ravsau
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Homework Statement
A certain type of laser emits light that has a frequency of 5.1* 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.6* 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 2.3* 10^8 m/s. How many wavelengths are there now in one pulse?
Homework Equations
lamda= c/f
The Attempt at a Solution
I tried multiplying speed of electromagnetic wave with the time and divided by the freq but the answer is not correct. I am doing it online I just have 1 more chance left. Help!