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 is [CPMT 1974, 78; CBSE PMT 1993]

\[\frac{1}{2}({{n}_{1}}-{{n}_{2}})\]

\[\frac{1}{2}({{n}_{1}}+{{n}_{2}})\]

Two adjacent piano keys are struck simultaneously. The notes emitted b

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 is [CPMT 1974, 78; CBSE PMT 1993]
A.	\[\frac{1}{2}({{n}_{1}}-{{n}_{2}})\]
B.	\[\frac{1}{2}({{n}_{1}}+{{n}_{2}})\]
C.	8
D.	\[2\,({{n}_{1}}-{{n}_{2}})\]
Answer» D. \[2\,({{n}_{1}}-{{n}_{2}})\]

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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 is [CPMT 1974, 78; CBSE PMT 1993]

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