Question: Radio waves of frequency 900 kHz are broadcast in step from two stations 15 kilometres apart.
a) What is the wavelength of the signals?
(c = 3 multiplied by 10`8 ms-1)
b) What is the path difference between the two waves received at a point P 6 kilometres from one station along a line directly towards the other?
c) Will a loud or weak signal be picked up by a receiver at P?
d) Explain what happens as the receiver is moved along the line between the stations.