Home
Class 12
PHYSICS
Two radioactive materials X1 and X2 co...

Two radioactive materials `X_1 and X_2` contain same number of nuclei. If `6lamdas^(-1) and 4lamdas^(-1)` are the decay constants of `X_1 and X_2` respectively, find the time after which ratio of number of nuclei undecayed of `X_1` to that of `X_2` will be 1/e

A

`1/(2lambda)s`

B

`1/(10lambda)s`

C

`1/(5lambda)s`

D

`1/(8lambda)s`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • NUCLEI

    AAKASH SERIES|Exercise Practice Exercise|40 Videos

  • NUCLEI

    AAKASH SERIES|Exercise Exercise-I|80 Videos

  • NUCLEAR PHYSICS

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE PRACTICE SHEET (ADVANCED) Integer Type Questions|4 Videos

  • OPTICAL INSTRUMENTS

    AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE -I) (OPTICAL INSTRUMENTS) (LEVEL-I (MAIN)) (SUBJECTIVE OBJECTIVE TYPE QUESTIONS)|21 Videos
AAKASH SERIES-NUCLEI-Exercise-II
  1. Plutonium decays with a half-life of 24,000 years. If plutonium is sto...

    Text Solution

    |

  2. T(1//2) for a radioactive nuclei is 12.5 hr. and its mass is 256 gm. T...

    Text Solution

    |

  3. Two radioactive materials X1 and X2 contain same number of nuclei. I...

    Text Solution

    |

  4. In order to dcrease radioactive nuclei to one million of its initial n...

    Text Solution

    |

  5. The half life of radium is 1600 years. The mean life of radium is

    Text Solution

    |

  6. Activity of radioactive element decreased to one third of original act...

    Text Solution

    |

  7. The half-life of a radioactive substance is 100 years, Calculate in ho...

    Text Solution

    |

  8. The counting rate observed from a radioactive source at t=0 second was...

    Text Solution

    |

  9. Two nuclei P, Q have equal no.of atoms at t= 0. Their half-life are 3 ...

    Text Solution

    |

  10. A sample radio active subsistence has 10^6 radio active radio active n...

    Text Solution

    |

  11. One mole of radium has an activity of 1/3.7 kilo curie. Its decay cons...

    Text Solution

    |

  12. A radioactive nucleus undergoes a series of decays according to the se...

    Text Solution

    |

  13. Tritium has a half life of 12.5Y undergoing beta decay. The fraction o...

    Text Solution

    |

  14. A freshly prepared radioactive source of half life 2 hours emits radia...

    Text Solution

    |

  15. If 10% of the radio active material decays in 5 days. The percentage o...

    Text Solution

    |

  16. A certain radioactive substance has a half life of 5 years. Thus for a...

    Text Solution

    |

  17. 200 Mev energy is released when one nucleus of .^235U undergoes fissio...

    Text Solution

    |

  18. In each fission of U^235, 200 MeV of energy is released. If a reactor ...

    Text Solution

    |

  19. In a nuclear fission 0.1% of mass is converted into energy. The energy...

    Text Solution

    |

  20. Calculate the energy released by fission from 2 g of .92^235U in k Wh....

    Text Solution

    |