David Sang and Graham Jones Solutions for Chapter: Waves, Exercise 7: Question

A plane's engine emits a note of constant frequency $120 \mathrm{Hz}$. It is flying away from a stationary observer at a speed of $80 \mathrm{m}{\mathrm{s}}^{-1}$. Calculate:

(a) The observed wavelength of the sound received by the observer

A plane's engine emits a note of constant frequency $120 \mathrm{Hz}$. It is flying away from a stationary observer at a speed of $80 \mathrm{m}{\mathrm{s}}^{-1}$. Calculate:

(b) Its observed frequency. (Speed of sound in air $=330 \mathrm{m}{\mathrm{s}}^{-1}$.)