Home
Class 12
PHYSICS
A man is watching two trains, one leavin...

A man is watching two trains, one leaving and the other coming in with equal speed of 4 m/s. If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air is `320(m)/(s)`) will be equal to

A

6

B

3

C

0

D

12

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • WAVE MOTION

    TARGET PUBLICATION|Exercise MCQ 7.1|61 Videos

  • SURFACE TENSION

    TARGET PUBLICATION|Exercise EVALUATION TEST|21 Videos

  • WAVE THEORY OF LIGHT

    TARGET PUBLICATION|Exercise EVALUATION TEST|20 Videos

Similar Questions

Explore conceptually related problems

A man is running with a fork of frequency 340 Hz towards a huge wall with a velocity 2m/s, then the number of beats heard per second is (Velocity of sound in air is 342 m/s)

A train is moving with speed 72 km/h towards a hill blows a whistle of frequency 1240Hz. the frequency of echo heard by driver is(speed of sound=330m/s)

A man is travelling in a train towards the station with a speed of 50 m/s. calculate the apparent frequency heard by him of whistle which is blown at the station with a frequency 200 Hz. Velocity of sound in air is 350 m/s.

Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other, both blow horns having frequency of 676 Hz. The beat frequency heard by each driver will be _____ Hz. [Velocity of sound in air is 340 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) .)

TARGET PUBLICATION-WAVE MOTION -MCQ 7.1
  1. A man is watching two trains, one leaving and the other coming in with...

    Text Solution

    |

  2. A travelling wave passes a point of observation. At this point, the ti...

    Text Solution

    |

  3. When a wave travels in a medium displacement of a particle is given by...

    Text Solution

    |

  4. A wave is represented by the equation y = A sin(10pix + 15pit + (pi)...

    Text Solution

    |

  5. A transverse wave of amplitude 0.5 m and wavelength 1 m and frequency ...

    Text Solution

    |

  6. The equation of a wave is y=4 sin[(pi)/(2)(2t+(1)/(8)x)] where y ...

    Text Solution

    |

  7. The equation of a wave is y =4 sin {(pi)/(2) (2t +(x)/(8))} ,where y,x...

    Text Solution

    |

  8. The equation of a wave of amplitude 0.02 m and period 0.04 s travellin...

    Text Solution

    |

  9. The path difference between the two waves y(1)=a(1) sin(omega t-(2pi...

    Text Solution

    |

  10. The equation of a transverse travelling on a rope is given by y=10sinp...

    Text Solution

    |

  11. A wave motion has the function y=a0sin(omegat-kx). The graph in figure...

    Text Solution

    |

  12. The eqyation of wave is x= 5sin ((t)/( 0.4) -( x)/(4))cm the maximum...

    Text Solution

    |

  13. The equation of sound wave travelling along negative X-direction is gi...

    Text Solution

    |

  14. A progressive wave is represented by the equation y= 0.5 sin ( 314t- ...

    Text Solution

    |

  15. A wave of frequency 400 Hz has a phase velocity of 300 m/s The phase d...

    Text Solution

    |

  16. A prograssive wave of frequency 500 Hz is travelling with a speed of 3...

    Text Solution

    |

  17. If the speed of the wave shown in the figure is 330m//s in the given m...

    Text Solution

    |

  18. The equation of a wave is y=A sin (2pint) When it is reflected at a f...

    Text Solution

    |

  19. A bat flying above lake emits ultrasonic sound of 100 kHz ,When this w...

    Text Solution

    |

  20. Two waves are represented by y(1)= a sin (omega t + ( pi)/(6)) and y(...

    Text Solution

    |

  21. Two waves represented by the following equations are travelling in the...

    Text Solution

    |