# Wave number range

1. Feb 17, 2008

### Winzer

1. The problem statement, all variables and given/known data
A 1ns pulse of electromagnetic waves would be 30cm long.
a) Consider such a pulse of 633 nm wavelength laser light. Find its central wavenumber and the range of wave numbers it is comprised of.
b) Repeat a except for a 1ns pulse of 100MHz radio
waves.

2. Relevant equations
$$k=\frac{2\pi}{\lambda}$$

3. The attempt at a solution
I got the central wavenumber with the above equation. But I am at a lost on where to go from there.

2. Feb 17, 2008

### Winzer

Do I have to deal with the gaussian wave packet & fouier transform?