JEE Advanced 2018 Physics question
Two men are walking along a horizontal straight line in the same direction. The man in front walks at a speed and the man behind walks at a speed . A third man is standing at a height above the same horizontal line such that all three men are in a vertical plane. The two walking men are blowing identical whistles which emit a sound of frequency . The speed of sound in air is . At the instant, when the moving men are apart, the stationary man is equidistant from them. The frequency of beats in , heard by the stationary man at this instant, is .
Solution
Each walker is 5 m horizontally from the foot of the stationary man, who is 12 m up, so each is 13 m away and the velocity component along the line of sight is with . The man behind approaches: component
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