Which of the following statements about electromagnetic and mechanical waves is true?
A. Electromagnetic waves must travel through a medium, but mechanical waves do not require a medium.
B. Mechanical waves must travel through a medium, but electromagnetic waves do not require a medium.
C. Mechanical waves sometimes travel through a vacuum, and electromagnetic waves sometimes travel through matter.
D. Electromagnetic waves travel mostly through matter, and mechanical waves travel mostly through a vacuum.
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Stage in which a typical star has completely stopped fusion
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Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.
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Chemistry, 22.06.2019 23:20
In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as
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Which of the following statements about electromagnetic and mechanical waves is true?
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