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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.

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a. lambda = c/nu = 3*10^8/900*10^3 = 333.33 m
b. The first wave would have travelled 9 km and the second wave ...

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