Show that when the speed of the source and the observer are small compared to the speed of sound in the medium, the change in frequency becomes independent of the fact whether the source is moving or the observer.

Explanation

If observer is moving, then
`f' = f ((nu +- nu_(o))/(nu)) = f (1 +- (nu_(o))/(nu))`
If source is moving, then
`f'=f((v)/(vpmv_(s)))`
`=f(1pm(v_(s))/(v))^(-1)=f(1pm(v_(s))/(v))`
If `v_(s)lt ltv`
Both expressions come out to be of simiar type.