Home
Class 11
PHYSICS
The frequency of a car horm is 400 Hz. I...

The frequency of a car horm is 400 Hz. If the horn is honked as the car moves with a speed `u_S=34(m)/(s)` through still air towards a stationary receiver, the wavelength of the sound passing the receiver is [velocity of sound is `340(m)/(s)`]

A

0.765 m

B

0.850 m

C

0.935 m

D

0.425 m

Text Solution

Verified by Experts

The correct Answer is:
A
The wavelength in front of the car is
`lamda=(v-u_S)/(f_S)=(340(m)/(s)-34(m)/(s))/(400Hz)`
`=0.765m`
Promotional Banner

Topper's Solved these Questions

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS|Exercise Multiple Correct|44 Videos

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS|Exercise Assertion-Reasoning|24 Videos

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS|Exercise Subjective|56 Videos

  • RIGID BODY DYNAMICS 2

    CENGAGE PHYSICS|Exercise Interger|2 Videos

  • SUPERPOSITION AND STANDING WAVES

    CENGAGE PHYSICS|Exercise Comprehension Type|5 Videos

Similar Questions

Explore conceptually related problems

A tuning fork of frequency 380 Hz is moving towards a wall with a velocity of 4(m)/(s) Then the number of beats heard by a stationary listener between direct and reflected sound will be (velocity of sound in air is 340(m)/(s) )

A motor car blowing a horn of frequency 124vib//sec moves with a velocity 72km//hr towards a tall wall. The frequency of the reflectedf sound heard by the driver will be (velocity of sound in air is 330 m//s )

The ratio of the apparent frequencies of a car when approaching and receding a stationary observer is 11:9 What is the speed of the car, if the velocity of sound in air is 330 m/s?

An engine blowing a whistle of frequency 133 Hz moves with a velocity of 60(m)/(s) towards a hiss from which an echo is heard. Calculate the frequency of the echo heard by the driver. (velocity of sound in air in 340(m)/(s) .)

The frequency of the sound emitted by the loudspeaker is 1020 Hz. Calculate the wavelength of the sound wave in air in cm where its velocity is 340 m/s.

A source of sound is travelling with a velocity of 30(m)/(s) towards a stationary observer. If actual frequency of source is 1000 Hz and the wind is blowing with velocity 20(m)/(s) in a direction at 60^@C with the direction of motion of source, then the apparent frequency heard by observer is (speed of sound is 340(m)/(s) )

Two cars A and B are moving towards each other with samne speed 25 m/s. wind is blowing with speed 5 m/s in the direction of motion of car A. The car A blows horn of frequency 300 Hz and the sound is reflected from car B. the wavelength of te reflected sound received by the driver of car A is (velocity of sound in air =330m/s)

A source of sonic oscillations with frequency n=1700Hz and a receiver are located on the same normal to a wall. Both the source and receiver are stationary, and the wall recedes from the source with velocity u=6.0(m)/(s) . Find the beat frequency registered by the receiver. The velocity of sound is v=340(m)/(s) .

A car is moving with 90 km h^(-1) blows a horn of 150 Hz, towards a cliff. The frequency of the reflected sound heard by the driver will be (speed of sound in air is 340 ms^(-1) )

A train standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air. The train begins to move with a speed of 30 m s^(- 1) towards the platform. The frequency of the sound heard by an observer standing on the platform is (Speed of sound in air = 330 m s^(-1) )

CENGAGE PHYSICS-SOUND WAVES AND DOPPLER EFFECT-Single Correct
  1. A source emitting a sound of frequency v is placed at a large distance...

    Text Solution

    |

  2. Due to a point isotropic sonic source, loudness at a point is L=60dB I...

    Text Solution

    |

  3. The frequency of a car horm is 400 Hz. If the horn is honked as the ca...

    Text Solution

    |

  4. Spherical sound waves are emitted uniformly in all direction from a po...

    Text Solution

    |

  5. When a person wears a hearing aid, the sound intensity level increases...

    Text Solution

    |

  6. A motorcycle starts from rest and accelerates along a straight line at...

    Text Solution

    |

  7. The difference in the speeds of sound in air at -5^@C, 60 cm pressure ...

    Text Solution

    |

  8. A train is moving in an elliptical orbit in anticlockwise sense with a...

    Text Solution

    |

  9. A stationary observer receives a sound from a sound of freqeuency v0 m...

    Text Solution

    |

  10. The sound from a very high burst of fireworks takes 5 s to arrive at t...

    Text Solution

    |

  11. A car emitting sound of frequency 500 Hz speeds towards a fixed wall a...

    Text Solution

    |

  12. In the figure shown, a source of sound of frequency 510 Hz moves with ...

    Text Solution

    |

  13. A wall is moving with velocity u and a source of sound moves with velo...

    Text Solution

    |

  14. For a sound wave travelling towards +x direction, sinusoidal longitudi...

    Text Solution

    |

  15. If the source is moving towards right, wavefront of sound waves get mo...

    Text Solution

    |

  16. Consider a souce of sound S, and an observer/detector D. The source em...

    Text Solution

    |

  17. When source and detector are stationary but the wind is blowing at spe...

    Text Solution

    |

  18. Figure. Represents the displacement y versus distance x along the dire...

    Text Solution

    |

  19. The driver of a car approaching a vertical wall notices that the frequ...

    Text Solution

    |

  20. The difference between the apparent frequency of a sound of soun as pe...

    Text Solution

    |