The sound of an acoustic resonator in the form of a two-pronged fork with the prongs formed from a U-shaped bar of elastic metal. It emits a pure musical tone and is frequently used as a standard of pitch to tune musical instruments. Wikipedia
In a random sample of videos for this class, we found 5 / 10 (50%) were accurate. Note that quality in the unbalanced training set may be significantly lower. Learn more.
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