Home
Class 12
PHYSICS
A source and detector both start moving ...

A source and detector both start moving simultaneously from the position shown in the figure, one along x-axis and the other along y-axis with speeds 40 `ms^(-1)` and 30 `ms^(-1)` respectively. If n is the frequency of the source then the graph between the apparent frequency n' observed by detector and time t would be [assume that source and detector do not collide]

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • JEE MOCK TEST 14

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

  • JEE MOCK TEST 17

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

Similar Questions

Explore conceptually related problems

A source and a listener are in unidirection at motion with velocities 30 and 45 km/hour respectively. If both have started to move simultaneously from same place, then apparent frequency heard by the listener will be -

Source and observer start moving simulatneously along x and y-axis respectively. The speed of source is twice the speed of observer V_0 . If the ratio of observer frequency to the frequency of the source is 0.75 , find the velocity of sound.

A car is moving along X-axis with a velocity v=20m//s . It sounds a whistle of frequency 660 Hz. If the speed of sound is 340m//s . The apparent frequency heard by the observer O (shown in figure) is:

(i) A source of sound emits waves of frequency f_(0) = 1200 Hz . The source is travelling at a speed of v_(1) = 30 m//s towards east. There is a large reflecting surface in front of the source which is travelling at a velocity of v_(2) = 60 m//s towards west. Speed of sound in air is v = 330 m//s . (a) Find the number of waves arriving per second at the reflecting surface. (b) Find the ratio of wavelength (lambda_(1)) of sound in front of the source travelling towards the reflecting surface to the wavelength (lambda_(2)) of sound in front of the source approaching it after getting reflected. (ii) A sound source (S) and an observer (A) are moving towards a point O along two straight lines making an angle of 60^(@) with each other. The velocities of S and A are 18 ms^( –1) and 12 ms^( –1) respectively and remain constant with time. Frequency of the source is 1000 Hz and speed of sound is v = 330 ms^( –1) . (a) Find the frequency received by the observer when both the source and observer are at a distance of 180 m from point O (see figure). (b) Find the frequency received by the observer when she reaches point O.

A source of sound emitting a 1200 Hz note travels along a straight line at a speed of 170 m s^-1 . A detector is placed at a distance of 200 m from the line of motion of the source. (a) Find the frequency of sound received by the detector at the instant when the source gets closest to it. (b) Find the distance between the source and the detector at the instant it detects the frequency 1200 Hz. Velocity of sound in air = 340 m s^-1 .

A sound source moving with speed 50 m/s along x-axis and observer at rest on y-axis.If the frequency observed by observer when source crosses the origin is 96 Hz, then the original frequency of source is :(speed of sound is given medium is 200 m/s)

On the same path, the source and observer are moving such a way that the distance between these two inicreases with the time. The speeds of source and observer are same and equal to 10ms^(-1) with respect to the ground while no wind in blowing. The apparent frequency received by observer is 1950 Hz then the original frequency must be (the speed of sound in present medium is 340 m//s

A source of frequency f is moving towards the observer along the line SO with a constant velocity upsilon_(s) as shown in figure. Plot f' versus t graph . Where f' is the changed frequency observed by the observer.

The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are v, v_(s) and v_(0) , then the apparent frequency heard by the observer will be (n = frequency of sound)

NTA MOCK TESTS-JEE MOCK TEST 15-MCQS (PHYSICS)
  1. The mass and the diameter of a planet are three times the repective v...

    Text Solution

    |

  2. Temperature and volume curves are drawn for two thermodynamic processe...

    Text Solution

    |

  3. A proton, a deuteron and an alpha- particle having the same kinetic en...

    Text Solution

    |

  4. An object is placed on the surface of a smooth inclined plane of incli...

    Text Solution

    |

  5. A 27 mW laser beam has a cross-sectional maximum electric field ...

    Text Solution

    |

  6. Two chemically non-reactive liquids are placed in a U-shaped tube as s...

    Text Solution

    |

  7. A thin bi-convex lens made out of a material of refractive index mu(1)...

    Text Solution

    |

  8. Three solids sphere each of mass m and diameter d are stuck together s...

    Text Solution

    |

  9. An ideal diode is connected in a circuit with resistance R=50Omega and...

    Text Solution

    |

  10. A thermally insulated vessel contains 150g of water at 0^(@)C. Then th...

    Text Solution

    |

  11. Suppose a quantilty x can be dimensionally represented in terms of M,L...

    Text Solution

    |

  12. A source and detector both start moving simultaneously from the positi...

    Text Solution

    |

  13. In a closed tube whose length can be altered by sliding one of the hal...

    Text Solution

    |

  14. An organ pipe of length L is open at one end and closed at other end. ...

    Text Solution

    |

  15. 10^(22) particles each of mass 10^(-26) Kg are striking perpendicular...

    Text Solution

    |

  16. A metal wire of circular cross-section has a resistance R(1). The wire...

    Text Solution

    |

  17. A power transmission line feeds input power at 2400V to a step-down tr...

    Text Solution

    |

  18. The largest magnitude the electric field on the axis of a uniformly ch...

    Text Solution

    |

  19. If the displacement (x) and velocity (v) of a particle executing SHM a...

    Text Solution

    |

  20. A body hanging from a spring stretches it by 1 cm at the earth's surfa...

    Text Solution

    |