The displacement y of a wave travelling in the x- direction is given by y = 10^-4 sin (800t -2xπ/3) metres, where x is expressed in metres and t in seconds. The speed of the wave-motion, is

Question:

Options :

(a) 200 m/s
(b) 400 m/s
(c) 600 m/s
(d) 1200 m/s

Answer :

(b) 400 m/s

Answer Steps :

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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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