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  • Solve this problem A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour.Hefinds the traffic has eased and a car moving ahead of him 18 km/hour is honking at afrequency of 1392 Hz. the speed of sound is 343 m/s, the frequ

A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds the traffic has eased and a car moving ahead of him 18 km/hour is honking at a frequency of 1392 Hz. the speed of sound is 343 m/s, the frequency of the honk as heard by him will be:

  • Option 1)

    1332 Hz

  • Option 2)

    1372 Hz

  • Option 3)

    1412 Hz

  • Option 4)

    1454 Hz

 

Answers (1)

best_answer

As discussed in @9352

\nu '= \nu \left ( \frac{v+v_{0}}{v+v_{s}} \right )

v_{c}= 18 \times \frac{5}{18}= 5\:ms^{-1}

v_{M}= 36 \times \frac{5}{18}= 10\:ms^{-1}

\nu '=1392\left ( \frac{343+10}{343+5} \right )= 1392 \left ( \frac{353}{348} \right )

\nu '=1412\:Hz


Option 1)

1332 Hz

This option is incorrect

Option 2)

1372 Hz

This option is incorrect

Option 3)

1412 Hz

This option is correct

Option 4)

1454 Hz

This option is incorrect

Posted by

divya.saini

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