Question

umerical Problems:
A person shouts loudly at the mouth of a well facing towards the water. The
echo is heard clearly after 0.2 seconds. What is the distance between the
person and the surface of water? [Velocity of sound in air = 332 m/s]​

Answer 1

Answer:

Atmospheric pollution can have natural sources, for example, volcanic eruptions. The gaseous by-products of man-made processes such as energy production, waste incineration, transport, deforestation and agriculture, are the major air pollutants.

Answer 2

Answer:

Let d be the distance of body from water level in well (depth of water level) , therefore total distance travelled by sound wave , =2d , as the wave comes back after reflection so the distance will be doubled .

Now given , v=340m/s,t=0.4s ,

therefore , by , total distance =velocity × total time

2d=v×t ,

or d=v×t/2=340×0.4/2=68m