Question

Take a metallic tumbler and a tablespoon. Strike the tablespoon gently at the brim of the tumbler (as shown in the figure above). Now suspend a small thermocole ball touching the rim of the tumbler and touch it to the vibrating tumbler. See how far the ball is displaced. Now, again strike the tablespoon at the brim of the tumbler but strike it hard this time. Again touch the thermocole to the vibrating tumbler and see how far the ball is displaced. Choose the correct option.

• A. Thermocole ball is displaced more when the tumbler is striked hard, as frequency if vibration is more in this case.
• B. The thermocole ball is displaced less when the tumbler is striked hard, as frequency of vibration is less in this case.
• C. The thermocole ball is displaced more then the tumbler is striked hard, as amplitude of vibration is more in this case.
• D. The thermocole ball is displaced more when the tumbler is striked hard, as amplitude of vibration is less in this case.

Answer 1

Answer: (C)

The thermocole ball is displaced more then the tumbler is striked hard, as amplitude of vibration is more in this case.

In our observation, we see that the thermocole ball is displaced more when the tumbler is stricken hard, as the amplitude of vibration is more in this case.

The loudness of sound is proportional to the square of the amplitude of the vibration producing the sound. For example, if the amplitude becomes twice, the loudness increases by a factor of 4. The loudness is expressed in a unit called decibel (dB).

The loudness of sound depends on its amplitude. When the amplitude of vibration is large, the sound produced is loud. When the amplitude is small, the sound produced is feeble.

Hence, option C is correct.