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Biology, 09.05.2021 06:40 yoboi33

21. Which is NOT a mechanical wave? A. the light from a flashlight
B. the sound heard from the cavity of a shell
C, the echo produced when you shout in a hall
D. the wave produced in a porcelain plate struck with a metal spoon​

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21. Which is NOT a mechanical wave? A. the light from a flashlight
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