Question

1. susan placed her cell phone inside of a glass casing and used a pump to remove all of the air from the jar. she then used her mother’s phone to call her cell phone and was not able to hear it ringing through the jar. explain why this is.

Explanation:

Sound waves need a medium (like air, liquid, or solid) to travel. When air was removed from the jar, there was a vacuum. Sound can't propagate through a vacuum, so Susan couldn't hear the ring.

Answer:

Sound requires a medium (such as air) to travel. The jar became a vacuum (no air) after pumping out air, and sound waves can't propagate through a vacuum, so the ring wasn't heard.