Physics-
General
Easy
Question
Two speakers S1 & S2 driven by the same amplifiers are placed at y=1m and y=-1m. The speakers vibrate in phase at 600 Hz. A man stands at a point on x-axis at a very large distance form the origin and starts moving parallel to y-axis. The speed of sound in air is 330 m/s
The angle 
at which intensity of sound drop to a minimum for the first time
- 4o
- 20.5o
- 7.9o
- 35o
The correct answer is: 7.9o
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