A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of\[19.4\,m{{s}^{-1}}\]at an angle of \[60{}^\circ \] with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air\[330\,m{{s}^{-1}}\]is
A) 97 Hz
B) 100 Hz
C) 103 Hz
D) 106 Hz
Correct Answer:
C
Solution :
Apparent frequency \[f'=f\left( \frac{V-{{V}_{0}}}{V-{{V}_{s}}\cos 60} \right){{V}_{0}}=0\]