Final answer:
Absorption in physics refers to the slowing down of a sound wave when it enters a new medium, caused by a change in properties of the medium.
Explanation:
Absorption is the term used when a sound wave is slowed by a new medium it passes through. When a wave enters a different medium, such as going from helium to air, it can slow down due to the change in properties of the medium. This process of reduction in the wave's speed is known as absorption.
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