Two trains are moving towards each other with speeds of $20\,\,m/s\,\,\,and\,\,\,15\,\,m/s$ relative to the ground. The first train sounds whistle of frequency $600\,{\rm{ }}Hz$, the frequency of the whistle heard by a passenger in the second train before the meets is (the speed of sound in air is $340{\rm{ }}m/s$)

JEE PHYSICS MCQ: WAVES

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Application +4 | -1

Two trains are moving towards each other with speeds of

20\,\,m/s\,\,\,and\,\,\,15\,\,m/s

relative to the ground. The first train sounds whistle of frequency

600\,\mathrm{ }Hz

, the frequency of the whistle heard by a passenger in the second train before the meets is (the speed of sound in air is

340\mathrm{ }m/s

)

View answer and explanation

Correct option: D

666\mathrm{ }Hz

Option D (

666\mathrm{ }Hz

) is correct because it is calculated using the Doppler effect formula for approaching source and observer.

Practice All Chapter MCQs →

3\,\,kHz

0.5

f\mathrm{ }Hz

V\mathrm{ }m/sec

0.2\,\,V

y = \frac{3}{{{{\left( {2x + 3t} \right)}^2} + 4}},

(– \mathrm{ve}) \,x

y = f(kx +\omega t),

X

0.01\,\,s

5 \mathrm{~m}

245 \mathrm{~g}

1 \mathrm{~kg}

g=980 \mathrm{~cm} \mathrm{~s}^{-2}

T

V