A) Zero
B) 2
C) 8
D) 4
Correct Answer: D
Solution :
Observer hears two frequencies (i) \[{{n}_{1}}\] which is coming from the source directly (ii) \[{{n}_{2}}\] which is coming from the reflection image of source so, \[{{n}_{1}}=680\left( \frac{340}{340-1} \right)\] and \[{{n}_{2}}=680\left( \frac{340}{340+1} \right)\] \[\Rightarrow \] \[{{n}_{1}}-{{n}_{2}}=4\]\[beats\]
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