Question 237: Waves

Question

A source of sound emits sound wave of frequency ' f ' and moves towards an observer with a velocity $\frac{\mathrm{V}}{3}$ where V is the velocity of sound. If the observer moves away from the source with a velocity $\frac{\mathrm{V}}{5}$ the apparent frequency heard by him will be

Accepted Answer

$$ \begin{aligned} &	ext { Apparent frequency, }\ &f^{\prime}=\frac{v-v_o}{v-v_s} f=\frac{v-\frac{v}{5}}{v-\frac{v}{3}}=\frac{\left(\frac{4 v}{5}ight)}{\left(\frac{2 v}{3}ight)} f=\frac{6}{5} f \end{aligned} $$

Answer

$\frac{15}{2} \mathrm{f}$

Answer

$\frac{8}{15} \mathrm{f}$

Answer

$\frac{6}{5} \mathrm{f}$

Answer

$\frac{15}{18} \mathrm{f}$

Waves

A source of sound emits sound wave of frequency ' f ' and moves towards an observer with a velocity \frac{\mathrm{V}}{3} where V is the velocity of sound. If the observer moves away from the source with a velocity \frac{\mathrm{V}}{5} the apparent frequency heard by him will be

Choose the correct answer: