How Many Wavelengths of Yellow-Green Light Fit in 0.500 mm?

[roxxyroxx]

Homework Statement

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?

Homework Equations

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

The Attempt at a Solution

?

 

[cepheid]

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?

 

[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
?

 

[cepheid]

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.