Question

If a sound is heard 4.23sec after a stone is dropped into a well of depth 78.4m deep,the velocity of sound in air is

Answer 1

Answer:

338 m/s

Explanation:

ssuming no air (or air drag) on stone, the time it takes stone to reach water is: 

t = √2h/g = √2(78.4)/9.81 = √15.98369 = 3.998 s 

time for sound to travel 78.4 m = 4.23 - 3.998 = 0.232 s 

speed of sound in well = 78.4/0.232 = 338 m/s ANS*