Answer to Question #157719 in Mechanics | Relativity for Samir khan

Question

What is the speed of an AM radio wave with a frequency of 10 ^ 6 * H * z and a wave length of 300m ?

Answer 1

Solution

$speed (v)=wavelength$ $/period$

since the period is the reciprocal of the frequency, from

$period=1/f$

by substituting into the above formula it yields

$speed=wavelength*frequency$

$V=\lambda$ $*f$

$\lambda$ $=300m$

$f=10Hz$

$V=300*10^6$

$V=3.0*10^8m/s$