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  • A train approaching a railway Platform with a speed of  80 m/s  starts blowing the whistle. speed of sound in air is  840 m/s. If the frequency of the emitted sound from the whi

A train approaching a railway Platform with a speed of  80 m/s  starts blowing the whistle. speed of sound in air is  840 m/s. If the frequency of the emitted sound from the whistle is 600 Hz, the frequency of sound as heard by person standing on the Platform =?

Option: 1

663.16


Option: 2

673.24


Option: 3

250.2


Option: 4

445.26


Answers (1)

best_answer

Vs=80 \mathrm{~m} / \mathrm{s} \quad V=840 \mathrm{~m} / \mathrm{s}

f=600 \mathrm{~Hz} \quad f^{\prime}=? \\

f^{\prime}=f\left(\frac{\mathrm{V}}{V-\mathrm{Vs}}\right) \\
f^{\prime}=600\left(\frac{840}{840-80}\right) \\

f^{\prime}=\frac{600 \times 840}{760}=\frac{60 \times 840}{76}=\frac{15 \times 840}{19} \\

f^{\prime}=\frac{12600}{19}=663.16 \\

f^{\prime}=663.16

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manish

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