Physics
When a tuning fork is sounded in air, the sound given by it is feeble. But when it is placed on a table top, the sound becomes much louder. The reason is :
- amplitude of the wave
- its prongs start vibrating rapidly
- presence of a surrounding wave
- large surface area of the vibrating body
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Answer
large surface area of the vibrating body
Reason — When the stem of a vibrating tuning fork is pressed against the top of a table, the tuning fork produces forced vibrations in the table top. The table top has a much larger vibrating area than the tuning fork, so the forced vibrations of the table top send forth a greater energy and produces a louder (or more intense) sound than that produced by the tuning fork.
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