Most appropriate unit of measurement should be centimetres, cm.
Answer:
This has all the answer (Data sheet, graph, answers to the questions, and the summary) :)
Sound is an example of a mechanical wave. Mechanical waves are the kinds of waves that cannot be propagated without a medium. As such, these waves cannot travel through a vacuum, just like how sound cannot travel through space, since space is a vacuum.
I think it is D
Hope my answer help you?
<span>79.75m/s .................................</span>
