The frequency range for FM broadcasts is 87.9 - 107.9 MHz in the U.S. In terms of wavelengths, the range corresponds to
A) 87.9 - 107.9 m.
B) 2.78 - 3.41 m.
C) 83.3 - 102.3 m.
D) 12.4 - 19.5 m.
E) None of these is correct.

Question

Quizplus · Accepted Answer

To find the wavelength range, we use the formula: 
wavelength = speed of light / frequency 
where the speed of light is approximately 3x10^8 m/s.

For 87.9 MHz: 
wavelength = 3x10^8 / 87.9x10^6 = 3.41 m

For 107.9 MHz: 
wavelength = 3x10^8 / 107.9x10^6 = 2.78 m

Therefore, the wavelength range for FM broadcasts in the U.S. is 2.78 - 3.41 m, which corresponds to choice B.

The Frequency Range for FM Broadcasts Is 87