A boy standing near a railway track found that the pitch of the siren of a train increases as it approaches him.
State the phenomenon behind it.

A boy standing near a railway track found that the pitch of the siren of a train increases as it approaches him. List two any applications of the same phenomenon.

The pitch of the siren of a fire engine increases as it approaches a boy standing at a bus stop.The phenomenon behind it, is due to ......

A boy is riding a bicycle with Its dynamo on when he Increases the speed the brightness of the bulb connected to the dynamo increases.State the law used to explain the above phenomenon.

When a body is projected into air with certain initial velocity making an angle with the horizontal,it will travel in a parabolic path. a)What are the vertical and horizontal components of velocity? b)With a diagram derive an expression for: (i)maximum height (ii) time of flight. c)A ball is dropped through the window of a train travelling with high velocity,to a man standing near the track.The ball _________ (i)falls down vertically. (ii)moves straight horizontally. (iii)follows an elliptical path. (iv)follows a parabolic path.