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
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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.