Question

. Two trains are moving towards each other at speeds of
20 m/s and 15 m/s relative to the ground. The first train
sounds a whistle of frequency 600 Hz. The frequency of
the whistle heard by a passenger in the second train before
the train meets is (the speed of sound in air is 340 m/s)
(a) 600 Hz
(b) 585 Hz
(c) 645 Hz
(d) 666 Hz​

Answer 1

Answer:

When the air columns in two pipes closed at one end of lengths 62 cm and 63 cm

are vibrating in fundamental mode, 7 beats are heard in 3 second. Neglecting end

correction, calculate velocity of sound in air.

Answer 2

Explanation:

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