Question

Explain with the help of an activity , the reflection of sound and state the laws.​

Answer 1

Answer:

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If a sound is not absorbed or transmitted when it strikes a surface, it is reflected. The law for reflection is the same as that of light, ie., the angle of incidence of a sound wave equals the angle of reflection, just as if it were produced by a 'mirror image' of the stimulus on the opposite side of the surface.

Answer 2

EXPERIMENT

Aim

To verify the laws of reflection of sound.

Theory

Sound: It is a form of energy produced by vibration and it needs medium to propagate.

Reflection of sound: As light reflects when it strikes any hard object (opaque), sound also gets reflected when it strikes any object.

Laws of Reflection of sound

The angle of incidence is always equal to the angle of reflection.

The incident sound wave, the normal and the reflected sound wave lie in the same plane.

Materials Required

Two highly polished metal tubes made up of stainless steel or aluminium of length 25 cm and diameter 2 cm, a drawing sheet, metal plate, a geometrical set, thumb pins, drawing board/table, stopwatch, metal stand.

Procedure

Fix the white sheet on drawing board with thumb pin.

Draw a line AB to place the metal plate as reflecting surface with the help of metal stand, and draw normal OP to this line as shown in the figure.

Now draw a line O C making an angle of 30° with the line OP.

Place one metal tube near to the point O of normal and metal plate on the line O C.

Place the tickling watch closer to one end of this metal tube.

Now place the second tube so that its one end is near to the point O. Bring your ear close to the other end and adjust its position such that it collects the maximum reflected sound.

Mark the position of the tube when it collects the clear and maximum reflected sound.

Draw an extended line of reflected sound wave and mark it as OD.

Measure the angle of incidence and the angle of reflection.

Follow the above procedure and record your observation thrice.

Result

The angle of incidence is equal to the angle of reflection.

The incident, normal and reflected sound waves lie in the same plane.

Precautions

The metal plate should be placed vertical on the drawing board.

Both the pipes used should be clean and shining.

The sound producer i.e. stopwatch should be placed closer to the end of the metallic tube.

Avoid touching of the source of sound to the metal tube.

Maintain complete silence in the lab.

I hope this will help you

Explanation:

Laws of sound reflection:-

1. The angle of reflection is always equal to the angle of incidence .

2. The reflected sound, the incident sound, and the normal sound belong in the same plane.