Question

1. We know that sound is produced by the vibrations of a body. However, the sounds produced by all vibrating bodies are not audible to humans. Explain.​

Answer 1

Answer

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• Sound waves are produce

• The vibrating object moves in one direction and compresses the air directly in front of it.
• As the vibrating object moves in the opposite direction, the pressure on the air is lessened so that an expansion, or rarefaction, of air molecules occurs.

• We know that we need a vibrating body for the production of sound. Can we hear the sound of all vibrating bodies?
• The fact is that sounds of frequencies less than about 20 vibrations per second (20 Hz) cannot be detected by the human ear. Such sounds are called inaudible.

• Sound is heard only if the body vibrates with a frequency of at least 20 Hz.
• Frequency of vibration of the pendulum is less than 20 Hz.
• Hence no sound is heard when the pendulum vibrates or oscillates in air.