(a) Name the unit used for measuring the sound level. (b) A vibra… - Vidyadip

Question

(a) Name the unit used for measuring the sound level.
(b) A vibrating tuning fork is held at a certain fixed length of an air column when a loud sound is heard. What phenomenon is responsible for it? How does the phenomenon occur?

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Answer

(a) Decibel ( dB ) is the unit used for measuring sound level.
(b) The phenomenon is resonance. It is because, at some particular length of air column, the natural frequency of the vibrating air column becomes equal to the natural frequency of tuning fork. These frequencies reinforce each other and hence, produce loud sound or resonance.

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