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## Homework Statement

If you create a 1 ms light pulse by turning a flashlight on and off, how long will the pulse take to reach the other side of the room 20m away? (in air at standard T and P) what is the length, in m, of the pulse?

I realize that light has a wavelength and when you pulse it that wavelength shouldn't change. Really I just don't know the right equations to solve the problem

I'm struggling with this pre-lab homework as I'm taking a physics paper out of interest and cannot find any concise or simple enough explanations of the answer in the readings I've been given or on the internet. Any help would be greatly appreciated.

Cheers