Home
Class 12
PHYSICS
A gamma-ray photon is passing near a nuc...

A `gamma`-ray photon is passing near a nucleus and breaks into an electron and positron. The region contains a uniform magnetic field B perpendicular to the plane of motion. Find the time after which they again converted into `gamma`-ray. The force of electrostatic interaction and gravitational interaction may be neglected

A

`(2pim)/(eB)`

B

`(pim)/(2eB)`

C

`(4pim)/(eB)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • MOCK TEST 1

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MCQs|48 Videos

  • MOCK TEST 3

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MCQs|41 Videos

Similar Questions

Explore conceptually related problems

A conducting ring of radius r and resistance R is placed in region of uniform time varying magnetic field B which is perpendicular to the plane of the ring. It the magnetic field is changing at a rate alpha , then the current induced in the ring is

A ring of mass m and radius r is rotated in uniform magnetic field B which is perpendicular to the plane of the loop with constant angular velocity omega_(0) .Find the net ampere force on the ring and the tension developed in the ring if there is a current i in the ring.Current and rotation both are clockwise.

A conducting loop (as shown) has total resistance R. A uniform magnetic field B=gammat is applied perpendicular to plane of the loop where gamma is a constant and t is time. The induced current flowing through loop is

Two parallel long smooth conducting rails separated by a distance l are connected by a movable conducting connector of mass m . Terminals of the rails are connected by the resistor R and the capacitor C as shown in figure. A uniform magnetic field B perpendicular to the plane of the rail is switched on. The connector is dragged by a constant force F . Find the speed of the connector as a function of time if the force F is applied at t = 0 . Also find the terminal velocity of the connector.

A conducting loop (as shown) has total resistance R. A uniform magnetic field B = gamma t is applied perpendicular to plane of the loop where gamma is constant and t is time. The induced current flowing through loop is

, ABCEFGA is a square conducting frame of side 2 m and resistance 1 Omega m^(-1) . A uniform magnetic field b is applied perpendicular to the plane and pointing inward. It increases with time at a constant rate of 10 T s^(-1) . Find the rate at which heat is produced in the circuit, AB = BC = CD = BH .

A small ball of mass m and charge q is attached to the bottom end of a piece of negligible mass thread of length l, whose top end is fixed. The system formed by the thread and ball is in vertical plane and is in uniform horizontal magnetic field B, which is perpendicular to the plane of figure and points into the paper The ball is started with a velocity v_(0) from lower most point of circle in a direction perpendicular both to the magnetic induction and to direction of thread. The ball moves along a circular path such that thread remains tight during the whole motion. Neglect any loss of enery. What is the magnitude of magnetic induction B, if the minimum initial speed at which the described motion of ball (complete vertical circular motion) occurs is V_(0)=(1)/(2)sqrt(17gL)

A charged particle of charge q and mass m, gets deflected through an angle theta upon passing through a square region of side 'a' which contains a uniform magnetic field B normal to its plane. Assuming that the particle entered the square at right angles to one side, what is the speed of the particle ?

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-MOCK TEST 2-MCQs
  1. Diameter of a plano-convex lens is 6cm and thickness at the centre is ...

    Text Solution

    |

  2. Two bars A and B of circular cross section, same volume and made of th...

    Text Solution

    |

  3. The surface of soap solution is 25xx10^-3Nm^-1. The excess pressure in...

    Text Solution

    |

  4. A sinusoidal wave travelling in the same direction have amplitudes of ...

    Text Solution

    |

  5. If a string fixed at both ends vibrates in four loops. The wavelength ...

    Text Solution

    |

  6. For a wave y = 0.02 sin [2pi (110 t -(x)/(3))+(pi)/(3)] is travellin...

    Text Solution

    |

  7. A beaker contains water up to a height h(1) and kerosene of height h(2...

    Text Solution

    |

  8. The Young's double slit experiment is carried out with light of wavele...

    Text Solution

    |

  9. At a point on the right bisector of a magnetic dipole the magnetic pot...

    Text Solution

    |

  10. The angular width of the central maximum of the diffraction patternn i...

    Text Solution

    |

  11. In fog, photographs of the objects taken with infrared radiations are ...

    Text Solution

    |

  12. Find the electric field in region II as in figure shown.

    Text Solution

    |

  13. A wire of 50 cm long, 1mm^(2) in cross-section carries a current of 4 ...

    Text Solution

    |

  14. A gamma-ray photon is passing near a nucleus and breaks into an electr...

    Text Solution

    |

  15. The frequency f of vibrations of a mass m suspended from a spring of s...

    Text Solution

    |

  16. The magnetic flux phi (in weber ) in a closed circuit of resistance 10...

    Text Solution

    |

  17. The enegy of photon corresponding to a radiatio of wavelength 600 nm i...

    Text Solution

    |

  18. Calculate the angular momentum of the electron in third orbit of hydro...

    Text Solution

    |

  19. The half-life of a radioactive substance is 10 days. The time taken fo...

    Text Solution

    |

  20. The current amplificationn factor for a transistor in its common emitt...

    Text Solution

    |