a) When do you hear a loud sound? b) When do you hear a feeble sound?

Question

Conduct an experiment to know the relationship between the intensity of sound produced by a body and the vibration of the body.

a) When do you hear a loud sound?

b) When do you hear a feeble sound?

c) What difference do you notice in vibrations of blade / scale during loud and feeble sounds?

d) What difference do you find in amplitude of vibration for a feeble and a loud sound in the above experiment?

Answer 1

Aim: To know the relation between the intensity of sound produced by a body and the vibrations of the body. Materials required: Wooden table, 30 cm metal scale or nearly 30 cm hacksaw blade and a brick.

Procedure: 

Place the blade/scale on the table, with 10cm of the blade on the surface of the table and rest of it in air. Keep a heavy brick on one end of the 10 cm blade/ scale kept on table

Vibration of the body and intensity of sound

Vibrate the blade gently and observe the vibrations and simultaneously listen to the sounds. Repeat the same 2-3 times and record observations in the table shown below.

Vibrate the blade using greater force. Observe the vibrations and listen to the sound. Repeat this for 2-3 times and record your observations in the table shown below.

Force	Vibrations of the. blade / scale	Intensity of sound
Small	50	Less
Large	50	More

a) When we applied large force we heard a loud sound.

b) When we applied less force we heard a feeble sound.

c) During loud sound the amplitude of vibration is more and for feeble sound the amplitude is less.

d) For a loud sound the amplitude is more and for a feeble sound the amplitude is less.