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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 16 - Waves and Acoustics > A sound wave of frequency n travels horizontally to the right with speed with speed c. It is reflected from a broad wall moving to the left with speed v. The number of beats heard by a stationary observer to the left of the wall is

A sound wave of frequency n travels horizontally to the right with speed with speed c. It is reflected from a broad wall moving to the left with speed v. The number of beats heard by a stationary observer to the left of the wall is

a person standing at a point O on a road perpendicular to the track hears a sound of frequency f. The distance of O from A at that time is 4m. If the original frequency is 640Hz A source of sound is travelling at 100/3 m/s along a road then the value of f is (given velocity of sound = 340m/s) towards a point A. When the source is 3m away from A