A source and a listener are both moving towards each other with speed `v//10`, where `v` is the speed of sound. If the frequency of the note emitted by the source is `f`, the frequency heard by the listener would be nearly

Options

A. `1.11 f`
B. `1.22 f`
C. `1.27 f`
D. `f`

Answer

B

Explanation

`{:(rarr v_(s) = v//10,,larr v_(o) = (v)/(10)),(overset(*)(S),overset(v)rarr,overset(*)(O)):}`
`f' = f((v+v_(o))/(v-v_(s))) = f((v+v//10)/(v-v//10))=1.22f`