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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 10 - Oscillation and Waves > Two sources of sound S1 and S2 produce sound waves of same frequency 660 Hz. A listener is moving from source S1 towards S2 with a constant speed um/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then, u equals:

Two sources of sound S1 and S2 produce sound waves of same frequency 660 Hz. A listener is moving from source S1 towards S2 with a constant speed um/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then, u equals:

A string 2.0m long and fixed at its ends is driven by a 240 Hz vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency is?