Physics homework question
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Physics homework question

[From: ] [author: ] [Date: 12-05-02] [Hit: ]
do the arithmetic.b) Same as above.......
FM radio bands range from 88 MHZ through
108 MHz.
The speed of light is 3 × 108 m/s.
a)What is the wavelength for the FM radio
band at 96 MHz?
Answer in units of m
b)What is the wavelength for the FMradio band
at 107 MHz?
Answer in units of m

-
Let me show you the normal way to show exponents here.
The speed of light is 3 × 10^8 m/s
where the ^ is shift+6. (Another way: 3E8 m/s.)

a) The formula that relates frequency, wavelength and speed of light is
c = lambda*f
Note the units. c has units of m/s, lambda has units of m, and frequency has units of Hz, which 50 years ago was called cycles/second. A cycle isn't really a unit, so frequency has units of s^-1. So do you see that the result of multiplying lambda by f would give you a result in units of m/s? That should help you remember without actually memorizing.

So if you want lambda, do the algebra to get lambda = c/f

You have a speed of 3 × 10^8 m/s and a frequency of 96 MHz or 96 x 10^6 Hz. Now, do the arithmetic.

b) Same as above.
1
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