## EM Energy Spectrum

$c=\lambda v$

Dayna Pham 1I
Posts: 98
Joined: Fri Sep 28, 2018 12:16 am
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### EM Energy Spectrum

Do we have to know the quantities of wavelengths for each category of light?

Such as gamma = 10^-12 m, and Radio waves = 10^3 m?

Thanks!

timschaeffer Dis 1J
Posts: 38
Joined: Fri Sep 28, 2018 12:18 am

### Re: EM Energy Spectrum

It obviously wouldn't hurt if you knew those values off the top of your head, but I don't remember Professor Lavelle stating specific wavelengths other than the general range for visible light (400nm-700nm) and UV(100nm-400nm).

I also don't remember Professor Lavelle saying that it was important to memorize the wavelengths of EMR.

I could be wrong but I doubt that having to identify the kind of radiation based on the wavelength will show up a ton on the test.

Its worth it to get your TA's opinion on this question though. I'd probably study it after I covered all the other topics.

Andrew Sun 1I
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

### Re: EM Energy Spectrum

pretty sure the values of frequencies will be given to us in the problem. Most problems state v= blank so i dont see why it wouldnt for those as well.

Fayez Kanj
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am
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### Re: EM Energy Spectrum

Hello!

I don't think you need to know the exact values. However, I know for a fact that we need to know the trends in the EM spectrum, which are:

Longer wavelength = lower frequency = lower energy

Shorter wavelength = higher frequency = higher energy

Hope this helps :)

Jaqueline Monreal 2L
Posts: 57
Joined: Fri Sep 28, 2018 12:28 am

### Re: EM Energy Spectrum

I'm pretty sure that the quantities of wavelengths for the light category that we need to use will be given to us, the outline doesn't say that we need to memorize them