A) 550 Hz
B) 555.5 Hz
C) 720 Hz
D) 500 Hz
Correct Answer: C
Solution :
Key Idea Apply Doppler's effect. |
Whenever there is a relative motion between a source of sound and the observer (listener), the frequency of sound heard by the observer is different from the actual frequency of sound emitted by source. |
Case I |
Case II |
[for case I] \[n'=\frac{v}{v-30}n\] ...(i) |
[for case II]\[n''=\frac{v+30}{v}n'\] ... (ii) |
From Eqs. (i) and (ii), we get |
\[n''=\frac{v+30}{v-30}n=\frac{360}{300}\times 600=720\,Hz\] |
\[=720\,Hz\] |
You need to login to perform this action.
You will be redirected in
3 sec