To a stationary listener, the frequency of the horn from a car approaching at 108 km/h appears to be 418 Hz. If the speed of sound in air is 330 m/s, the true frequency of the horn is

Question:

Options :

(a) 348 Hz
(b) 380 Hz
(c) 460 Hz
(d) 502 Hz

Answer :

(b) 380 Hz

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:

In an a. c. circuit the instantaneous current and e.m.f. are represented as: I = I0 sin(ωt – π/6) and E = E0 sin(ωt + π /3) respectively. The voltage leads the current by

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