Home
Class 12
PHYSICS
The freqency of a radar is 780 M hz. The...

The freqency of a radar is 780 M hz. The frequency of the reflected wave from an aerolane is increased by 2.6 kHz. The velocity of aeroplane is

A

0.25 km/s

B

0.5 km/s

C

1.0 km/s

D

2.0 km/s

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • RACE

    ALLEN|Exercise Basic Maths (Wave Motion & Dopplers Effect) (Superposition of waves interfarence, beats)|15 Videos

  • NEWTONS LAWS OF MOTION

    ALLEN|Exercise EXERCISE-III|28 Videos

  • SIMPLE HARMONIC MOTION

    ALLEN|Exercise Example|1 Videos

Similar Questions

Explore conceptually related problems

The frequency of waves emitted from a radar is 750 MHz. The frequency of reflected wave from the aeroplane as observed at the radar station is incrased by 2.5 KHz. The speed of aeroplane is.

Bus moving with speed v forwards a stationary wall. it produces sound of frequency f = 420 Hz. The heard frequency of reflected sound from wall by driver is 490 Hz . Calculate the speed v of bus. The velocity of sound in air is 330 m/s .

The frequency of a radar is 780 MHz. After getting reflected from an approaching aeroplane, the apparent frequency is more than the actual frequency by 2.6 kHz. The aeroplane has a speed of

In a SONAR, ultrasonic waves are sent into the sea water and the reflected waves from a sunken ship are received after 2.0 s. If the velocity of waves in sea water is 1450 m s^(-1) , find the depth of the sunken ship.

Microwaves are reflected from a distant airplane approaching a stationary observer. It is found that when the reflected waves beat against the waves radiating from the source, the beat frequency is 900 Hz. Calculate the approach speed of the airplane if the wavelength of the microwave is 0.1 H. Velocity of microwave is 3 xx 10^(8)" m/s".

An indian submarine is moving in the Arabian sea with constant velocity. To detect enemy it sends out sonar waves which travel with velocity 1050(m)/(s) in water. Initially the waves are getting reflected from a fixed island and the reflected waves are coming back to submarine. The frequency of reflected waves are detected by the submarine and found to be 10% greater than the sent waves. Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. Q. The velocity of enemy ship should be

An indian submarine is moving in the Arabian sea with constant velocity. To detect enemy it sends out sonar waves which travel with velocity 1050(m)/(s) in water. Initially the waves are getting reflected from a fixed island and the reflected waves are coming back to submarine. The frequency of reflected waves are detected by the submarine and found to be 10% greater than the sent waves. Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. Q. The velocity of enemy ship should be

A car emitting sound of frequency 500 Hz speeds towards a fixed wall at 4(m)/(s) . An observer in the car hears both the source frequency as well as the frequency of sound reflected from the wall. If he hears 10 beats per second between the two sounds, the velocity of sound in air will be

A “RADAR' is able to detect the reflected waves from an enemy's aeroplane after a time interval of 0:02 milli-second. If the velocity of the waves is 3 xx 10^8 m s^(-1) , calculate the distance of the aeroplane from the radar.

The frequency of a sound wave is n and its velocity is v. If the frequency is increased to 4n, the velocity of wave will be

ALLEN-RACE-Basic Maths (Wave Motion & Dopplers Effect) (Stationary waves & doppler effect, beats)
  1. The freqency of a radar is 780 M hz. The frequency of the reflected wa...

    Text Solution

    |

  2. A locomotive approaching a crossing at a speed of 20 ms^(-1) sounds a ...

    Text Solution

    |

  3. An aluminum rod having a length 100 cm is clamped at its middle point ...

    Text Solution

    |

  4. A tuning fork and an air column whose temperature is 51^(@)C produc...

    Text Solution

    |

  5. A uniform string resonates with a tuning fork , at a maximum tension o...

    Text Solution

    |

  6. If in a stationary wave the amplitude corresponding to antinode is 4 c...

    Text Solution

    |

  7. What is the phase difference between the displacement wave and pressur...

    Text Solution

    |

  8. A wire of length 'l' having tension T and radius 'r' vibrates with fun...

    Text Solution

    |

  9. Equation of a standing wave is expressed as y = 2A sinomegat coskx. In...

    Text Solution

    |

  10. Two vibrating strings of same material stretched under same tension an...

    Text Solution

    |

  11. The wave-function for a certain standing wave on a string fixed at bot...

    Text Solution

    |

  12. In a standing wave on a string.

    Text Solution

    |

  13. A string vibrates in 5 segments to a frequency of 480 Hz. The frequen...

    Text Solution

    |

  14. A 2.0m long string with a linear mass density of 5.2xx10^(-3) kg m^(-1...

    Text Solution

    |

  15. A wave is given by the equation y = 10 sin 2 pi (100 t - 0.02 x) + ...

    Text Solution

    |

  16. In case of closed organ pipe, which harmonin the p^(th) overtone will ...

    Text Solution

    |

  17. An organ pipe open at one end and closer at other has a length L. the ...

    Text Solution

    |

  18. The first resonance length of a resonance tube is 40 cm and the second...

    Text Solution

    |

  19. A man sitting in a moving train hears the whistle of the engine. The f...

    Text Solution

    |

  20. A whistle of frequency 500 Hz tied to the end of a string of length 1....

    Text Solution

    |