## Practice Quiz 1 Question [ENDORSED]

$c=\lambda v$

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YsabelCheang1H
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Joined: Wed Sep 21, 2016 2:59 pm

### Practice Quiz 1 Question

The question is FM radio station CHEM broadcasts at 99.5 MHz. Calculate the wavelength of the corresponding radio waves.
What is the question asking for when it states "corresponding radio waves"?

Toshio_Kanazawa_3B
Posts: 4
Joined: Wed Sep 21, 2016 2:58 pm

### Re: Practice Quiz 1 Question  [ENDORSED]

They're just asking for the wavelength of the broadcast's radio waves. Since you know the frequency is 99.5 MHz and you know that radio waves are a type of electromagnetic radiation (so they move at the speed of light), you can just use the equation C = wavelength x frequency and solve for the wavelength. Hope that helps!

Timothy Yu 2M
Posts: 17
Joined: Wed Sep 21, 2016 2:58 pm

### Re: Practice Quiz 1 Question

For the units, will they always be in nanometers? Or will we have to like convert it into meters since meters is the SI unit?

William Shu 1G
Posts: 18
Joined: Wed Sep 21, 2016 2:56 pm

### Re: Practice Quiz 1 Question

I'm fairly certain that as a wavelength, you can keep the units as nanometers.

aprilhamachi3B
Posts: 9
Joined: Wed Sep 21, 2016 2:58 pm

### Re: Practice Quiz 1 Question

Unless he specifies, I don't think it matters if you leave it in meters or nanometers. Typically yes the SI unit is meters, but if the question ever asks to compare it to the line spectrum then its easier to compare it when your answer is in nanometers.

Logan 3C
Posts: 22
Joined: Wed Sep 21, 2016 2:57 pm

### Re: Practice Quiz 1 Question

Actually if you want the units to match up you should put it in meters. A joule (the unit for energy) is comprised of (kg x m^2 / s^2) so if you want the units to better match up you should convert nanometers to meters. Just be sure to convert it back to nanometers if it asks you f this answer is in the visible light spectrum.

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