chaychay763
chaychay763 chaychay763
  • 09-05-2021
  • Biology
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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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Jennifer10154 Jennifer10154
  • 09-05-2021
I believe the answer is d
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