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Answered

1. Strike the tuning fork or a metal with pencil. Then holds it close to your ears. What was produced? What caused the sounds?​

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Answer:

What was produced ?

- Sound

What caused the sounds ?

- Vibration

The basic cause of Sound is the vibration of particles. Vibrations of particles cause vibration in the medium in which the particles are present. The medium may be air, water, etc, which help in the propagation of the sound waves.

Simple thank you is enough.