A man watching two trains, one leaving and another coming in with equal speeds of 4 m/s. If they sound their whistles each of frequency 240 Hz, the number of beats heard by the man will be (Take velocity of sound as 320 m/s

Question:

Options :

(a) 24
(b) 12
(c) 18
(d) 6

Answer :

(d) 6

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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