Question

how does energy travel in a mechanical wave?

○ in a vacuum

○ in space

○ in a medium

○ in time

Explanation:

Mechanical waves require a medium (like air, water, or solids) to transfer energy. They can't travel in a vacuum (unlike electromagnetic waves). "In space" is vague and not specific to mechanical waves' energy transfer, and "in time" is incorrect as energy in waves travels through space - related medium, not time. So the correct option is the one about a medium.

Answer:

C. in a medium (assuming the options are labeled A: in a vacuum, B: in space, C: in a medium, D: in time; if labels differ, adjust but the correct text is "in a medium" with its option identifier)