A local radio station broadcasts radio waves at 99.7
MHz. Unlike
sound, radio waves can pass into outer space, because
they are disturbances
not in air molecules but in the e-m fields that exist
even in the vacuum of
space. It’s energy traveling independent of
matter.
a. When that radio wave hits you, how many pulses (wave crests)
of em
radiation hit you per minute (60 seconds)? (reminder: M = 10
6)
b. Radio waves move at the speed of light (c), how far apart is
each
wave crest (wavelength)?
c. If we boosted the signal strength so that station could be
heard on
the moon, would either the wavelength or frequency change?