Question:
If a body is producing waves of frequency 17MHz and you are moving towards the body at half the speed of light, then what is the frequency of waves coming towards you
Answer:
According to Doppler effect, when the listener moves towards the source and the source is at rest, then the frequency is given by (v+ vL) / v * f
Velocity of listener vL is given as half the speed of light = c/2; v = c = 3* 108 m/s; f = 17 * 106 Hz
Frequency of waves = (1 + ½)c / c * 17 * 106 = 3/2 * 17 * 106 = 25.5 * 106 Hz
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