Anoisy toy is placed in a glass jar. all the air is then slowly removed from the jar. how does this affect the sound you hear?

The sound will become weaker and weaker, and then it will disappear

Explanation:

Sound is a mechanical wave, which consists in oscillations that propagate through matter carrying energy. The oscillations in a mechanical wave are due to the vibrations of the particles of the medium, which (in the case of the sound wave) oscillate in a direction parallel to the direction of motion of the wave (this type of waves is called longitudinal wave).

As a result, mechanical waves can propagate only in a medium: they cannot propagate in vacuum. Therefore, as the air inside the jar is slowly removed, the intensity of the sound will become weaker (because there will be less molecules of air, so the sound wave will transmit less efficiently), and when all the air will be removed, there will be no sound at all since sound waves cannot propagate through vacuum.

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