Question

Which of the following will produce sound through vibration?

• A. a plastic scale when bent over the edge of a bench
• B. saying "Ah" for few seconds
• C. plucking a rubber string by fingers
• D. all

Answer 1

The correct option is D all

We know that sound is produced whenever there is any vibration.

All vibration produces sound. In some cases vibrations are visible to our naked eyes but in some cases they can only be felt not seen.

In all the above activities , there is some kind of vibration involved. So sound can be produced.

For example.

Plastic scale when bent and left again vibrates rapidly and saying 'Ah' from mouth involves vibration of vocal cord.And plucking a rubber string vibrates the string rapidly.So all these cases produce sound.