Question

If the splash is heard 4.23 seconds after a stone is dropped into a well. 78.4 metes deep, find the velocity of sound in air?

Answer 1

Here, depth of well = S = 78.4m 

Total time after which splash is heard = 4.23s 

If t₁ = time taken by store to hit the water surface is the well 

t₂ = time taken be splash of sound to reach the top of well. 

then t₁ + t₂ = 4.23 sec. 

Now, for downward journey of stone;