Even how much energy a boy uses up to shout at the top of his voice, he could not be heard if he is in a vacuum. Why is it so?
A. Because he cannot breath in a vacuum.
B. Because the boy`s voice is not loud enough.
C. Because sound wave is a mechanical wave.
D. Because a sound wave travels both in a vacuum and in air.
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b there in a few days ago and I don't want to go back and I don't want to go back and I don't want to go back and I don't want to go back and
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