A) 2.5 m/s
B) 15.0 m/s
C) 5.5 m/s
D) 10.0 m/s
Correct Answer: A
Solution :
[a] |
\[f=660\text{ }Hz,v=330\text{ }m/s\] |
\[{{f}_{1}}=f\left( \frac{\text{v}-u}{\text{v}} \right)\] |
\[{{f}_{2}}=f\left( \frac{\text{v+}u}{\text{v}} \right)\] |
\[{{f}_{2}}-{{f}_{1}}=\frac{f}{\text{v}}[v+u-(v-u)]\] |
\[10={{f}_{2}}-{{f}_{1}}=\frac{f}{\text{v}}[2u]\] |
\[u=2.5m/s\] |
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