A) \[{{n}_{1}}+{{n}_{2}}\]
B) \[\frac{{{n}_{1}}+{{n}_{2}}}{2}\]
C) \[{{n}_{2}}-{{n}_{1}}\]
D) \[{{n}_{1}}-{{n}_{2}}\]
Correct Answer: C
Solution :
When A and B are sounded together the number of beats \[={{n}_{1}}\] When A and C are sounded together the number of beats \[={{n}_{2}}\] So, the number of beats produced when B and C are sounded together \[={{n}_{2}}-{{n}_{1}}\]
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