A vibrating tuning fork causes an identical fork nearby to vibrate. This is called
1) refraction.
2) resonance.
3) beats.
4) reverberation.
For this to occur, both forks must have the same (or multiple)
5) intensities.
6) amplitudes.
7) frequencies.
8) geometries.
9) all of these.
Answer: 2, 7
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