Home
Class 12
PHYSICS
A radioactive sample contains 1.00xx10^1...

A radioactive sample contains `1.00xx10^15` atoms and has an activity of `6.00xx10^11` Bq. What is its half-life?

Text Solution

Verified by Experts

The correct Answer is:
A, B
`R=lambdaN`
`6xx10^11=1.0xx10^15 lambda`
`:.` `lambda=6xx10^-4s` `t_(1//2)=(1n2)/(lambda)=(0.693)/(6xx10^-4)s`
`=1155s=19.25` min
Promotional Banner

Topper's Solved these Questions

  • MODERN PHYSICS - 2

    DC PANDEY|Exercise Level 1 Subjective Questions|1 Videos

  • MODERN PHYSICS - 2

    DC PANDEY|Exercise Level 2 Single Correct|13 Videos

  • MODERN PHYSICS - 2

    DC PANDEY|Exercise Level 1 Objective|17 Videos

  • MODERN PHYSICS - 1

    DC PANDEY|Exercise Level 2 Subjective|23 Videos

  • NUCLEI

    DC PANDEY|Exercise C MADICAL ENTRANCES GALLERY|46 Videos

Similar Questions

Explore conceptually related problems

A radioactive substance contains 10^15 atoms and has an activity of 6.0xx10^11 Bq. What is its half-life?

Iiodine -131 is a radioactive isdotpe. If 1.0 mg of ""^(131)I has an activity of 4.6xx10""^(12) Bq. What is the half-life of ""^(131)I (in days)

A sample of a radioactive element that contains 1.0 xx 10^(3) nuclie decays to 6.2 xx 10^(1) nuclei in 10minutes . What is its sepecific decay constant?

A samp,le of a radioactive elements that contains 1.0xx10^(3) nuclei decays to 6.2xx10^(1) nuclei in 10minutes. What is its specific day constant?

A sample of radioactive material has an activity of 9xx10^(12) Becquerel. The material has a half life of 80s. How long will it take for the activity to falls to 2xx10^(10) Becquerel ?

A radioactive sample with half-life 2 days has initial activity 32mu Ci . What will be its activity after 8 days?

The decay constant of a radioactive element is 1.05xx10^(-4) / year. What is its half life ?

The half life of radioactive substance is 1.1xx10^7 s. What is the decay rate for 4.4xx10^15 atoms of the substance ?

A radioactive sample has 8.0xx10^(18) active nuclei at a certain instant. How many of these nuclei will still be in the active state after two half-life ("in" xx10^(18)) ?

The activity of a radioactive sample is 1.6 curie, and its half-life is 2.5 days . Its activity after 10 days will be

DC PANDEY-MODERN PHYSICS - 2-Level 1 Subjective
  1. The disintegration rate of a certain radioactive sample at any instant...

    Text Solution

    |

  2. A radioactive sample contains 1.00xx10^15 atoms and has an activity of...

    Text Solution

    |

  3. Obtain the amount of ^60Co necessary to provide a radioactive source o...

    Text Solution

    |

  4. The half-life of 92^238U against alpha decay is 4.5xx10^9 year. How mu...

    Text Solution

    |

  5. What is the probability that a radioactive atom having a mean life of ...

    Text Solution

    |

  6. In an ore containing uranium, the ratio of ^238U to 206Pb nuclei is 3....

    Text Solution

    |

  7. Complete the following reactions. (a) 88^226 Rararralpha+ (b) 8^19Or...

    Text Solution

    |

  8. Consider two decay reactions. (a) 92^236Urarr82^206Pb+10 protons+20 ...

    Text Solution

    |

  9. Obtain the binding energy of a nitrogen nucleus from the following dat...

    Text Solution

    |

  10. 8 protons and 8 lectures are separately at rest. How much energy will ...

    Text Solution

    |

  11. Assuming the splitting of U^235 nucleus liberates 200 MeV energy, find...

    Text Solution

    |

  12. 83^212Bi decays as per following equation. 83^212Birarr82^208Ti+2^4H...

    Text Solution

    |

  13. In a neutron induced fission of 92U^235 nucleus, usable energy of 185 ...

    Text Solution

    |

  14. Calculate the Q-values of the following fusion reactions: (a)1^2H+1^2H...

    Text Solution

    |

  15. Calculate the Q-values of the fusion reaction He^4+He^4 = Be^8 In s...

    Text Solution

    |

  16. When fission occurs, several neutrons are released are released and th...

    Text Solution

    |