JEE (Advanced) 2018 Paper-1 Question 8


For each question, enter the correct numerical value (in decimal notation, truncated/rounded-off to the second decimal place; e.g. 6.25, 7.00, -0.33, -.30, 30.27, -127.30) using the mouse and the on-screen virtual numeric keypad in the place designated to enter the answer.

Question 8

Two men are walking along a horizontal straight line in the same direction. The man in front walks at a speed 1.0 $$ms^{-1}$$ and the man behind walks at a speed 2.0 $$ms^{-1}$$ . A third man is standing at a height 12 ๐‘š 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 1430 ๐ป๐‘ง. The speed of sound in air is 330 $$ms^{-1}$$ . At the instant, when the moving men are 10 ๐‘š apart, the stationary man is equidistant from them. The frequency of beats in ๐ป๐‘ง, heard by the stationary man at this instant, is __________.

Correct Answer: e

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