Question

demonstrate that loudness increase on increasing the amplitude of vibrations.

Answer 1

There are two factors responsible for contributing to the sound one is the amplitude and second is the frequency and the loudness which results because of the amplitude is not proportionate and vibrations are responsible for making the sound, on the other hand amplitude is responsible for the size of the vibration and frequency affects the speed of the vibration and contributes to the pitch of the sound.

So a sound with the same level of amplitude but a different frequency will have a different level of loudness when reaches the human ear.

Answer 2

Aim: To know the relation between the intensity of sound produced by a body and the vibrations [amplitude] of the body.
Materials Required:
--> wooden table
--->Hack saw blade
---> Long brick
Procedure :
⇒Place the Hack Saw blade  on the table with 10cm of the blade on the surface and rest in the air.
⇒Keep a heavy brick on one end of the blade which is kept on the table.
⇒Vibrate the blade gently and observe the vibrations and simultaneously listen the sounds
⇒Repeat the experiment 2-3 times and record the observations in the table.
⇒Now vibrate the blade using higher force
⇒observe the vibrations.

Observation :
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Force                  Vibration of Blade              Intensity of Blade   
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Small force
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Large Force
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conclusion: From the above activity we conclude that  as Force increases, the displacement as well as amplitude increases.
So when amplitude increases of sound increases , intensity of sound  also increases.