1.

Two adjacent piano keys are struck simultaneously. The notes emitted by them have frequencies `n_(1) and n_(2)` . The number of beats heard per second isA. `(1)/(2) (n_(1)-n_(2))`B. `(1)/(2) (n_(1)+n_(2))`C. `n_(1) ~ n_(2)`D. `2 (n_(1)-n_(2))`

Answer» Correct Answer - C


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