A) 109 vib/s
B) 132 vib/s
C) 140 vib/s
D) 248 vib/s
Correct Answer: C
Solution :
Here observer is also acting as a sources, therefore apparent frequency heard by observer is \[n'=n\left( \frac{v+{{v}_{o}}}{v-{{v}_{s}}} \right)\] \[=124\left( \frac{330+20}{330-20} \right)\] \[\because \] \[[{{v}_{o}}={{v}_{s}}=72\times \frac{5}{18}=20m/s]\] \[=124\times \frac{350}{310}\] \[=140vib/s\]You need to login to perform this action.
You will be redirected in
3 sec