Question 248: Waves

Question

If a source emitting waves of frequency ' $F$ ' moves towards an observer with a velocity $\frac{\mathrm{V}}{3}$ and the observer moves away from the source with a velocity $\frac{\mathrm{V}}{4}$, the apparent frequency as heard by the observer will be ( $\mathrm{V}=$ velocity of sound)

Accepted Answer

$$ \begin{aligned} &	ext { Apparent frequency, }\ &f^{\prime}=\frac{v-v_0}{v-v_s} f=\frac{v-\frac{v}{3}}{v-\frac{v}{4}}=\frac{\left(\frac{2 v}{3}ight)}{\left(\frac{3 v}{4}ight)} F=\frac{8}{9} F \end{aligned} $$

Answer

$\frac{9}{8} \mathrm{~F}$

Answer

$\frac{8}{9} \mathrm{~F}$

Answer

$\frac{3}{4} \mathrm{~F}$

Answer

$\frac{4}{3} \mathrm{~F}$

Waves

If a source emitting waves of frequency ' F ' moves towards an observer with a velocity \frac{\mathrm{V}}{3} and the observer moves away from the source with a velocity \frac{\mathrm{V}}{4}, the apparent frequency as heard by the observer will be ( \mathrm{V}= velocity of sound)

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