## Problem 7 Quiz 1 Preparation in the Workbook [ENDORSED]

$c=\lambda v$

AsthaPatel4B
Posts: 17
Joined: Sat Jul 09, 2016 3:00 am

### Problem 7 Quiz 1 Preparation in the Workbook

Can somebody explain to me how the final units of measurements come out to hertz?

7.If the wavelength of orange-yellow light is 6.2x10^2 nm, what is its frequency?
c=wavelength*frequency
frequency=c/wavelength
frequency=(2.99x10^8 m*(s^-1))/(6.2x10^2 nm)
frequency=(2.99x10^8 m*(s^-1))/6.2x10^-7 m)=4.8x10^14

So, I did the problem above and got the right numerical answer, but I don't understand why the final units for the answer are in hertz. Please help.

Shirley_Zhang 3O
Posts: 35
Joined: Wed Sep 21, 2016 2:56 pm

### Re: Problem 7 Quiz 1 Preparation in the Workbook  [ENDORSED]

Hertz = 1/second or second^-1
so if we ignore the number, the calculation would look like the following:

(meter*second^-1) / (meter) = second^1 = hertz

which corresponds to

speed of light / wavelength = frequency