b. The frequency of the radio wave will be MUCH HIGHER
The frequency is related to the speed of the wave:
v=fl
or
f=v/l
The speed v of sound is
340 m/s
The speed of radio waves is
3 x 108 m/s.
Let's say the wave length is 2 m. That would make the frequency for sound:
f=340 m/s/2m = 170 Hz.
and for radio waves, that move at the speed of other Electro Magnetic Radiation, a.k.a. light:
f=3x108 m/s / 2 m = 1.5 x 108 Hz.