wave_mechanics dopplers_effect Question 25
Question: A table is revolving on its axis at 5 revolutions per second. A sound source of frequency 1000 Hz is fixed on the table at 70 cm from the axis. The minimum frequency heard by a listener standing at a distance from the table will be (speed of sound = 352 m/s)
[MP PET 1996]
Options:
A) 1000 Hz
B) 1066 Hz
C) 941 Hz
D) 352 Hz
Show Answer
Answer:
Correct Answer: C
Solution:
For source vS = $ r\omega =0.70\times 2\pi \times 5=22 $ m/sec Minimum frequency is heard when the source is receding the man.
It is given by $ {n _{\min }}=n\frac{v}{v+v _{s}} $ = $ 1000\times \frac{352}{352+22}=941 $
$ Hz $
BETA
