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Find an FM Radio station's wavelength, frequency given 
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#1
Sep2207, 04:02 PM

P: 177

1. The problem statement, all variables and given/known data
An FM radio station broadcasts at a frequency of 101.3 MHz. What is the wavelength? 2. Relevant equations Vsound = 343m/s @ 20 deg C λ = v/f 3. The attempt at a solution I used the formula λ = v/f and got something similar to 3.38 * 10 ^ 6 meters...kinda small, and the MHz/Hz difference doesnt matter since that is a decimal place thing, which doesn't change the value...anyways..the computer says the answer is 2.96 ....anybody know why? so i moved on to the next subproblem: What is the frequency of a sound source that produces the same wavelength in 20 deg C air? The answer is 116 Hz , which makes sense once you use 2.96 and Vsound = 343 and manipulate the formula. And since the question asks about 20 deg C, I then thought that perhaps the first question was refering to 0 deg C, but still I didnt get 2.96, so it is still incorrect... what am I doing wrong? Thanks! 


#2
Sep2207, 04:25 PM

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Sci Advisor
PF Gold
P: 4,980

A radio station broadcasts radio waves which are EM waves not sound waves. Thus v for the radio station will be the speed of light.



#3
Sep2207, 04:54 PM

P: 177

......................oh lol
thanks!!! 


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