On a windless day, when the speed of sound in air is v, a stationary highway police detects a drop of 12.5% in the pitch of the horn of a car. The car is

Question:

Options :

(a) approaching with a speed 1/7 v
(b) receding with a speed 1/7 v
(c) approaching with a speed 1/9 v
(d) receding with a speed 1/8 v

Answer :

(b) receding with a speed 1/7 v

Answer Steps :

step 1

step 2

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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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