A source of sound frequency 600 Hz is placed inside water .the speed of sound in water is 1500m/s and in air is 300m/s. The frequency if sound recorded by an observer ,who is standing in air is.

Question:

Options :

a)200Hz
b)3000Hz
c)120Hz
d)600hz

Answer :

d)600hz

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:

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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