Question

A source of sound is kept in a jar in a vacuum .Air is slowly introduced to the jar .

what happened to the sound coming out of the jar

Answer 1

i thought that air can't affect the speed of sound. so i mean that the sound remains unchanged.

Answer 2

The intensity of the sound increases

Step-by-step explanation:

Sound is a mechanical wave, that is produced by the oscillations of the particles in a medium. In this case, for example, sound is produced by the vibrations of the air particles.

At the beginning, since there is no air in the jar, no sound is produced, because there are no air particles that can vibrate, to transmit the sound. As air is slowly introduced to the jar, the sound intensity starts to increase. More specifically, the sound gets louder as more air is introduced in the jar. This is because the sound intensity depends on the air density: the greater the density, the more the air particles are, so we have a larger number of vibrations and so the sound gets louder.