A source of sound emits waves with frequency $f$ (in Hz) and has speed $v\text{ ms}^{-1}$. Two observers…
A source of sound emits waves with frequency $f$ (in Hz) and has speed $v\text{ ms}^{-1}$. Two observers move away from this source in opposite directions each with a speed $0.2\ v$ relative to the source. The ratio of frequencies heard by the two observers will be
$3 : 2$
$2 : 3$
$1 : 1$
$4 : 10$
Solution
Both the listeners hear the same decreased frequencies.