Home
Class 12
PHYSICS
A policeman on duty detects a drop of 10...

A policeman on duty detects a drop of `10%` in the pitch of the horn of a moving car as it crosses him. If the velocity of sound is `330 m//s`, the speed of the car will be

A

`17.4 m//s `

B

`20.4 m//s`

C

`18.7 m//s `

D

`16.4 m//s `

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • WAVES

    AAKASH INSTITUTE|Exercise ASSIGNMENT ( SECTION-A ( Objective type Questions ))|49 Videos

  • WAVES

    AAKASH INSTITUTE|Exercise ASSIGNMENT ( SECTION-B ( Objective type Questions ))|42 Videos

  • WAVES

    AAKASH INSTITUTE|Exercise Assignment (Section-J) (Paragraph Type Questions)|4 Videos

  • WAVE OPTICS

    AAKASH INSTITUTE|Exercise Assignment (Section-J (Aakash Challengers question))|1 Videos

  • WORK, ENERGY AND POWER

    AAKASH INSTITUTE|Exercise Assignment (SECTION - D)|15 Videos

Similar Questions

Explore conceptually related problems

A policeman on duty detects a drop detects a drop of 15% in the pitch of the horn of a motor car as it crossed him. If the velocity of sound is 330metre //sec ., calculate speed of the car.

A gatekeeper in a colony observes a drop of 10% in the pitch of a motor car as it crosses him. Calculate the speed of motor car if velocity of sound is 332 m/s.

Explain the formatin of stationary wave by analytical method. Show that nodes and antinodes are equally spaced in a stationary wave. The speed limit for a vehicle on road is 120 km/hr. A policeman detects a drop of 10 % in the pitch of horn of a car as it passes him. Is the policeman justified in punishing the car driver for crossing the speed limit ? ( Given : Velocity of sound = 340 m/s )

A person feels 2.5% difference of frequency of a motor-car horn. If the motor-car is moving towards the person and the velocity of sound is 320 m/s, then the velocity of motor car will be (approximately)

A car sounding a horn of frequency 1000 Hz passes an observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is 11 : 9. If the speed of sound is v , the speed of the car is

A racing car moving towards a cliff, sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v is the velocity of sound, then the velocity of the car is

A toy-car, blowing its horn, is moving with a steady speed of 5 m//s, away from a wall. An observer, towards whom the toy car is moving, is able to heat 5 beats per second. If the velocity of sound in air is 340 m/s, the frequency of the horn of the toy car is close to :

AAKASH INSTITUTE-WAVES-EXERCISE
  1. A plane progressive wave propagating along positive x-axis is

    Text Solution

    |

  2. The wave function of a pulse is given by y=(5)/((4x+6t)^(2)) where x a...

    Text Solution

    |

  3. The equation of the progressive wave, where t is the time in second ,...

    Text Solution

    |

  4. A transversee wave propagating on the string can be described by the...

    Text Solution

    |

  5. A rope of length L and mass m hangs freely from the ceiling. The veloc...

    Text Solution

    |

  6. the speed of sound in hydrogen at NTP is 1270m/s. then the speed in m/...

    Text Solution

    |

  7. A copper wire is held at the two ends by rigid supports . At 50^(@)...

    Text Solution

    |

  8. The wavelength of sound waves in hydrogen gas corresponding to th...

    Text Solution

    |

  9. An iron block is dropped into a deep well. Sound of splash is heard ...

    Text Solution

    |

  10. If the intensity of sound is increased by a factor of 30, by how many ...

    Text Solution

    |

  11. Two superimposig waves are represented by equation y1=2 sin 2 pi ( 1...

    Text Solution

    |

  12. A wave represented by the equation y=acos(kx-omegat) is superposed wit...

    Text Solution

    |

  13. A wire of mass 5 gram is kept stretched by a force of 400 N. When pluc...

    Text Solution

    |

  14. If the fundamental frequency of string is 220 cps , the frequency of ...

    Text Solution

    |

  15. Which of the following wave phenomenon is not shown by sound wave ?

    Text Solution

    |

  16. The fundamental frequency of a pipe closed at one end is 100Hz. If cl...

    Text Solution

    |

  17. Two tuning fork A and B are sounded together gives 5 beats per second...

    Text Solution

    |

  18. A policeman on duty detects a drop of 10% in the pitch of the horn of ...

    Text Solution

    |

  19. Two sources A and B are sounding notes of frequency 660 Hz. A listene...

    Text Solution

    |