A) \[\frac{{{u}_{1}}}{{{u}_{2}}}\]
B) \[{{u}_{1}}+{{u}_{2}}\]
C) \[\frac{{{u}_{2}}}{{{u}_{1}}}\]
D) \[{{u}_{1}}-{{u}_{2}}\]
Correct Answer: D
Solution :
The number of beats produced per second is called beat frequency \[v={{v}_{1}}-{{v}_{2}}\]
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