1.

:2. A stone is dropped into a well of depth 44.1 mt. The splash of water is heard after secCalculate the velocity of sound (g = 9.8 mt/sec)[367.5 ms

Answer»

Time taken by the stone to reach the water surface can be calculated using the equation of motions = ut + ½ gt2

Gere u = 0, s = 44.1 m , g = 9.8 m/s2

Sot = (2x44.1/9.8)½

= 3 s

Therefore time taken by sound to travel this distance = 3/2 - 3 = 3-6/2

= -3/2

= -1.5 s

Speed of sound in air = distance covered/Time = 44.1 m/ (1.5 s) = 29.4 m/s

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