Question

spread some sawdust or mustard seeds or sand on the diaphragm of a table or on a plate as shown in a picture knock on the diaphragm lightly with a finger?​

Answer 1

Answer:

When the diaphragm of a table is knocked lightly, it starts vibrating. It keeps on vibrating till the sound is produced. Due to these vibrations, sawdust or mustard seeds or sand particles also show movements. But when the sound stops these particles also stop their movements.

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