COMEDK2013PhysicsWaves and Sound
The difference between the apparent frequency of a source of sound as perceived by the observer during its approach and recession is 2 % of the frequency of the source. If the speed of sound in air is 300 ~ms ⁻¹ , then the velocity of the source is
Options
- A1.5 ~ms ⁻¹
- B12 ~ms ⁻¹
- C6 ~ms ⁻¹
- D3 ~ms ⁻¹
Correct answer
D. 3 ~ms ⁻¹
Step-by-step solution
If frequency of source be f_ s , then f_ approach -f_ recession = 2 100 f_ o f_ s ( v+v_ s v )-f_ s ( v-v_ s v )= f_ s 50 2 v_ s v = 1 50 2 v_ s 300 = 1 50 v_ s = 300 2 50 =3 ~ms ⁻¹