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WITCHER [35]
3 years ago
13

Somebody help?? I don't know how to do this

Chemistry
1 answer:
Alex_Xolod [135]3 years ago
5 0
It's been a while since I've done this stuff... I'm pretty confident 3. is decibels. 2 could be perception (because perception is the pitch that a human hear designates to the frequency it receives). I'm unsure about the first one.
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