Question

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in which direction of the wave motion do longitudinal waves transfer energy?
perpendicular
parallel
close
equal

Explanation:

Longitudinal waves are defined as waves where the particle displacement is parallel to the direction of wave propagation (and thus energy transfer). Transverse waves transfer energy perpendicular to wave motion. "Close" and "equal" are not relevant to wave energy transfer direction. So the correct option is the one with "parallel".

Answer:

B. parallel (assuming the options are labeled with "parallel" as option B; if the original options had different labels, adjust accordingly, but based on the content, the correct choice is the one with "parallel" as the description)