Question

experiment to prove reflection of sound​

Answer 1

Answer:

Explanation:

xperiment

Connect the bell to the battery so that it starts ringing. Arrange the bell jar around the bell and connect it to a vacuum pump.

Start the vacuum pump so that it starts evacuating air from the bell jar. Keep on observing the sound of the ringing bell all the time.

We observe that we keep on hearing the sound of the bell after the bell jar is kept over it. As the air inside the bell jar is slowly evacuated, the sound becomes dimmer and dimmer after sometime we cannot hear it at all.

But the bell still vibrates.

Thus we conclude that the bell reaches us through the air in the bell jar.

When the vacuum pump removes air from the bell jar, the sound does not reach us even thought the bell is vibrating.

Answer 2

Answer:

Two metal or cardboard tubes are set up, inclined to one another in a horizontal plane, and pointing towards a vertical flat surface of any hard material, e.g., a drawing-board.

Two metal or cardboard tubes are set up, inclined to one another in a horizontal plane, and pointing towards a vertical flat surface of any hard material, e.g., a drawing-board.A ticking watch is placed near the end of one tube and the ear is placed at the end of the other tube. Sound waves pass down the first tube and are reflected from the board, The loudness of the sound heard through the second tube is found to be a maximum when the board is adjusted so that the normal to it lies in the plane of the tubes and makes equal angles with their axes. Under these conditions the incident and reflected waves and the normal are in the same plane and the angle of incidence is equal to the angle of reflection. Sound thus obeys the same laws of reflection as light.