QJEEAdv23Ph40d2: JEE Advanced 2023 Physics - Class 11 JEEAdv23Ph40d2 Solution: Consider both sources emitting sound. When is at and approaches …

Question

Verified Solution • 2025–26 Session moderate

Consider both sources emitting sound. When

S_2

is at

R

and

S_1

approaches the detector with a speed

4 \mathrm{~m} \mathrm{~s}^{-1}

, the beat frequency measured by the detector is _________

\mathrm{Hz}

.

Accepted Answer

\begin{aligned}&amp; f_0=656 \mathrm{~Hz} \\\\&amp; v=324 \mathrm{~m} / \mathrm{s}\end{aligned}

Frequency heard due to movement of

\left(S_1\right)

\begin{aligned}&amp; f_1=\left(\frac{v}{v-u_s}\right) f_0 \\\\&amp; f_1=\frac{324}{320} \times 656\end{aligned}

And frequency heard due to movement of

\left(S_2\right)

f_2=656 \mathrm{~Hz}

\therefore

Beat frequency

\Delta f=f_1-f_2=656\left(\frac{324}{320}-1\right)

\Rightarrow

\Delta f=8.2

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