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Jorja De Jesus 2C
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Joined: Sat Jul 20, 2019 12:15 am


Postby Jorja De Jesus 2C » Sun Oct 13, 2019 1:04 am

(a) Radio waves for the FM station "Rock 99 at 99.3 on the FM dial" are generated at 99.3 MHz. What is the wavelength of the station? (b) Radioastronomers use 1420.-MHz waves to look at interstellar clouds of hydrogen atoms. What is the wavelength of this radiation?

Eesha Sohail 1D
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am

Re: 1A.8

Postby Eesha Sohail 1D » Sun Oct 13, 2019 3:58 am

I can see how the dash in the second question might be offputting, but it looks like a misprint. Otherwise, this looks like a standard
problem to me. Was there something specific that was confusing in this question? It seems like the procedure is to find wavelength by isolating lambda and inputting the frequency given as well as the speed of light.


Ryan Yee 1J
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

Re: 1A.8

Postby Ryan Yee 1J » Sun Oct 13, 2019 10:16 am

First convert MHz to Hz by multiplying by 10^6, then plug the new frequency into the equation c=(wavelength)(frequency), where c is the speed of light. Then divide by frequency to isolate wavelength.

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