A) \[\frac{2u}{\lambda }\]
B) \[\frac{u}{\lambda }\]
C) \[\frac{u}{2\lambda }\]
D) \[\frac{\lambda }{u}\]
Correct Answer: A
Solution :
\[{{n}_{1}}=\left( \frac{v+u}{v} \right)n\] and \[{{n}_{2}}=\left( \frac{v-u}{v} \right)n\] Number of beats per second \[x={{n}_{1}}-{{n}_{2}}\] \[=\left( \frac{v+u}{v} \right)n-\left( \frac{v-u}{v} \right)n\] \[=\left( \frac{v+u-v+u}{v} \right)n\] \[=2u\left( \frac{n}{v} \right)=\frac{2u}{\lambda }\]You need to login to perform this action.
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