Two trains, both travelling at 252 km/h, approach each other. If one of the trains blows a whistle of frequency 900 Hz, the frequency of the sound as heard by the driver of the other train is (Speed of sound in air =350m/s

Question:

Options :

(a) 600 Hz
(b) 643 Hz
(c) 1260 Hz
(d) 1350 Hz

Answer :

(d) 1350 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:

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