A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms-1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330 ms-1)

Question:

Options :

a)765Hz
b)800Hz
c)838Hz
d)885Hz

Answer :

c)838Hz

Answer Steps :

Step:-1

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An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

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