A) \[{{v}^{1}}=\left[ \frac{v-{{v}_{s}}}{v} \right]v\]
B) \[{{v}^{1}}=\left[ \frac{v-{{v}_{0}}}{v-{{v}_{s}}} \right]v\]
C) \[{{v}^{1}}=\left[ \frac{v}{v-{{v}_{s}}} \right]v\]
D) \[{{v}^{1}}=\left[ \frac{v}{v-{{v}_{s}}} \right]v\]
Correct Answer: C
Solution :
If the source is approaching the stationary observer with speed \[{{v}_{s}},\]then apparent frequency heard by observer is\[v=\frac{v}{v-{{v}_{s}}}v\]
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