# Period of a monocromatic light?

## Homework Statement

What is the period of a monochromatic light with a wavelength of 660nm?
f=660nm

## Homework Equations

T= 1/f (I think?)

## The Attempt at a Solution

T = 1/660nm
The period of this monochromatic light is 0.00152 waves/nm.
Firstly, I don't know for sure that the variable T is equal to period, as this is review of last years stuff i've forgotten. Also, just to ask a quick question in this thread for my next question so I don't have to post it here, in the formula v = f& (the & is actually a weird greek symbol), what does the & stand for?

## Answers and Replies

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cristo
Staff Emeritus
Science Advisor
T=1/f is correct, but f here stands for frequency. In your question, the wavelength is 660nm, not the frequency. First, you need to use the equation $v=f\lambda$ to calculate the frequency, then use the formula for time period. The "weird greek symbol" is the greek letter lambda and stands for wavelength.

Thanks a lot for the help.