Home
Class 12
CHEMISTRY
Half-life for certain radioactive elemen...

Half-life for certain radioactive element is `5 min`. Four nuclei of that element are observed at a certain instant of time. After `5` minutes
STATEMENT-I: It can be definitely said that two nuclei will be left undecayed.
STATEMENT-II: After half-life that is `5` minutes, half of totan nuclei will disintegrate. So, only two nuclei will be left undecayed.

Text Solution

Verified by Experts

The correct Answer is:
[F]
Calculation is applicable on the large amount of ratio active substance and it is propable.
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

The half life of a radioactive element is 8 hours. A given number of nuclei of that element is reduced to 1//4 of that number after two hours.

Half life of a radioactive element is 10 days. What percentage of the element will remain undecayed after 100 days?

What % age of a given mass of a radioactive substance will be left undecayed after five half life periods?

A certain radioactive element has a half-life of 20 years . If we have a block with 10 g of the element in it, after how

The half-life of a radioactive element is 100 minutes . The time interval between the stage to 50% and 87.5% decay will be:

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be :

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be

A radioactive nulei has half-life of 1.0 minute. If one of the nuclie decay now, the next nuclei will decay after:

BANSAL-RADIO ACTIVITY-Exercise-3
  1. True or False Statements : The S.I. unit of activity is Curie (Ci).

    Text Solution

    |

  2. True or False Statements : 90% of a radioactive sample is left undec...

    Text Solution

    |

  3. Half-life for certain radioactive element is 5 min. Four nuclei of tha...

    Text Solution

    |

  4. True or False Statements : 5 alpha and 4 beta^(-) are emitted during...

    Text Solution

    |

  5. True or False Statements : The ratio t(1//2) //t(7//8) for a first o...

    Text Solution

    |

  6. Classify each of the following nuclides as either "beta(.(-1)^(0)beta)...

    Text Solution

    |

  7. Which of the following are radioacitve? a. .(48)Cd^(114) b. .(49)...

    Text Solution

    |

  8. Consider the following nuclear reactions : I .(7)^(14)N+.(2)^(4)Hera...

    Text Solution

    |

  9. The activity of the radioactive sample drops to (1/64)^(th) of its o...

    Text Solution

    |

  10. The half life period of .(53)I^(125) is 60 days. What % of radioactivi...

    Text Solution

    |

  11. At any given time a piece of radioactive material (t(1//2)=30 days) c...

    Text Solution

    |

  12. An isotope of Potassium .(19)^(40) K has a half life of 1.4 xx 10^(9...

    Text Solution

    |

  13. At a given instant there are 25% undecayed radioactive nuclei in a s...

    Text Solution

    |

  14. Calculate the energy released in joules and MeV in the following nucle...

    Text Solution

    |

  15. A sample of U^(238) ("half life" = 4.5 xx 10^(9)yr) ore is found to co...

    Text Solution

    |

  16. Calculate the age of a vegetarian beverage whose tritium content is on...

    Text Solution

    |

  17. Ac^(227) has a half life of 22 year . The decay follows two parallel p...

    Text Solution

    |

  18. Nuclei of .^(64)Cu can decay be electron capture (probability 61%) or ...

    Text Solution

    |

  19. In one of neutron induced fission of .(92)U^(235),. (38)Sr^(90) & .(54...

    Text Solution

    |

  20. Most of the weight of the human body is because of the water present...

    Text Solution

    |