C=λV units question


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Claire Vandenberg 4L
Posts: 5
Joined: Wed Sep 21, 2016 2:56 pm

C=λV units question

Postby Claire Vandenberg 4L » Mon Oct 03, 2016 1:10 pm

When you are solving for wavelength with a known frequency (in Hz), and a known speed (3.00 * 10^8 m.s-1), what unit do you get for wavelength? Nm or m?

Tiffany_Hoang_3C
Posts: 20
Joined: Wed Sep 21, 2016 2:59 pm

Re: C=λV units question

Postby Tiffany_Hoang_3C » Mon Oct 03, 2016 1:35 pm

The wavelength will be in meters. Rearranging the equation for wavelength, λ=c/v. Since c is in m/s and the frequency is in Hz (which is s^-1 or 1/s), the s will cancel out, leaving you with m.

Alex Phu 2c
Posts: 22
Joined: Wed Sep 21, 2016 3:00 pm

Re: C=λV units question

Postby Alex Phu 2c » Tue Oct 04, 2016 11:16 am

When you solve for wavelength and use dimensional analysis, you should end up with meters. I think most wavelengths are measured in nm by the electromagnetic spectrum so if you want to compare your answer to other wavelengths converting it is probably the best way to go!

Edgar Khachatryan 3G
Posts: 20
Joined: Fri Jul 15, 2016 3:00 am

Re: C=λV units question

Postby Edgar Khachatryan 3G » Tue Oct 04, 2016 3:49 pm

Wavelength must always be calculated or used in a calculation in meters.


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