CBSE-XI-Physics
16: Sound Wave
- #16A small source of sounds moves on a circle as shown in figure (16-Q1) and an observer is sitting at O. Let
v1, v2, v3be the frequencies heard when the source is at A, B and C respectively.
(a)
v1>v2>v3
(b)
v1=v2>v3
(c)
v2>v3>v1
(d)
v1>v3>v2digAnsr: cAns : (c) `` {\,\mathrm{\,\nu \,}}_{2}>{\,\mathrm{\,\nu \,}}_{3}>{\,\mathrm{\,\nu \,}}_{1}``
At B, the velocity of the source is along the line joining the source and the observer. Therefore, at B, the source is approaching with the highest velocity as compared to A and C. Hence, the frequency heard is maximum when the source is at B.
Page No 352: