## HW 1.9 [ENDORSED]

$c=\lambda v$

Posts: 30
Joined: Fri Apr 06, 2018 11:02 am

### HW 1.9

For the last line of problem 9, I converted nm to m and used the formula v=c/lambda to get the frequency. However I keep getting 1.2*10^-1 Hz whereas the solution manual says that it's supposed to be 1.2*10^17 Hz. Can somebody help me figure this out please? Thank you!

MeghetyManoyan1A
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

### Re: HW 1.9  [ENDORSED]

When you convert nm to meters, you get 2.5x10^-9 meters. Using the formula, you need to divide c (the speed of light), which is 3.0x10^8 m/s, by the wavelength, which you found to be 2.5x10^-9 meters. This should give you 1.2x10^17 Hz as the frequency.