# Homework Help: Physics wave question

1. May 30, 2009

### roxxyroxx

1. The problem statement, all variables and given/known data
Yellow-green light has a frequency of 5.50 x 10^14 Hz. how many wavelengths of this light can fit into a space 0.500 mm wide?

2. Relevant equations

not sure ..
xn/L = n(lambda)/d
??

3. The attempt at a solution
????

2. May 30, 2009

### cepheid

Staff Emeritus
The logically prior question to ask would seem to be, how big is ONE wavelength? You are given a frequency. Do you know what the relationship is between frequency and wavelength?

3. May 30, 2009

### roxxyroxx

f = c/wavelength
so wavelength = c/f
= (3.00 x 10^8 m/s)/(5.50 x 10^14 Hz)
= 5.45 x 10^-7 m
?

4. May 30, 2009

### cepheid

Staff Emeritus
Okay, so how many of those wavelengths fit into half a millimetre?

And why the question marks? If you don't understand what are you are doing conceptually and are just manipulating equations, then I would recommend asking for clarification. This is not just an exercise in math.