A) \[10<({{n}_{1}}-{{n}_{2}})<20\]
B) \[5<({{n}_{1}}-{{n}_{2}})>20\]
C) \[5<({{n}_{1}}-{{n}_{2}})<20\]
D) \[0<({{n}_{1}}-{{n}_{2}})<10\]
Correct Answer: D
Solution :
[d] As number of beats/sec = diff. in frequencies has to be less than 10, therefore \[0<({{n}_{1}}-{{n}_{2}})<10\]
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