A) 103 Hz
B) 106 Hz
C) 97 Hz
D) 100 Hz
Correct Answer: A
Solution :
[a] Here, original frequency of sound, \[{{f}_{0}}=100\,Hz\] Speed of source \[{{V}_{s}}=19.4\,\cos \,60{}^\circ =9.7\] From Doppler?s formula \[f={{f}_{0}}\left( \frac{V-{{V}_{0}}}{V-{{V}_{s}}} \right)\] \[f=100\left( \frac{V-0}{V-(+9.7)} \right)\] \[f=100\frac{V}{V\left( 1-\frac{9.7}{V} \right)}=\frac{100}{\left( 1-\frac{9.7}{330} \right)}=103\,Hz\] Apparent frequency \[f=103\,Hz\]You need to login to perform this action.
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