Home
Class 12
CHEMISTRY
A radioactive element gets spilled over ...

A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room ?

A

1000 days

B

300 days

C

10 days

D

100 days

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • RADIOACTIVITY

    MOTION|Exercise EXERCISE - 2|15 Videos

  • RADIOACTIVITY

    MOTION|Exercise EXERCISE - 3|23 Videos

  • RADIOACTIVITY

    MOTION|Exercise EXERCISE - 4 LEVEL - II|20 Videos

  • PERIODIC TABLE

    MOTION|Exercise Exercise - 4 | Level-II|22 Videos

  • S-BLOCK

    MOTION|Exercise EXERCISE - 3 Level - II Previous Year | JEE adv|4 Videos

Similar Questions

Explore conceptually related problems

A radioactive element gets spilled over the floor of a room. Its half life period is 30 days. If its initial activity is ten times the permissible value, after how many days will it be safe to enter the room?

Radioactive elements is spread over a room, its half life is 30 day, Its activity is 50 times the permissible value. After how many days will it be safe?

A certain element has half life period of 30 days. Find its average life

A radioactive element (t_(1//2) = 50 days) is spread over a room. Its activity is 30 times the permisisble value for safe working. Calculate the number of days after which the room will be available for safe working.

A radioactive element has half-life period of 30 days. How much of it will be left after 90 days?

A radioactive element has half life period of 30 days. How much of it will be left after 90 days?

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

MOTION-RADIOACTIVITY -EXERCISE - 1
  1. The half life of Tc^(99) is 6.0 hr. The delivery of a sample of Tc^(9...

    Text Solution

    |

  2. How many atoms of 0.1 g-atom of a radioacitve isotope .(Z)X^(A) (half ...

    Text Solution

    |

  3. A radioacive element decays by parallel path as given below: A overs...

    Text Solution

    |

  4. Two radioactive nuclides A and B have half-lives 50 min and 10 min res...

    Text Solution

    |

  5. A radioactive sample had an initial activily of 56 dpm (disintegratio...

    Text Solution

    |

  6. The radioactivity of sample is R(1) at a time T(1) and R(2) at a time ...

    Text Solution

    |

  7. .(13)Al^(27) is a stable isotope. .(13)Al^(29) is expected to disinteg...

    Text Solution

    |

  8. Loss of beta-particles is equivalent to

    Text Solution

    |

  9. Which of the following nuclear reactions will generate an isotope ?

    Text Solution

    |

  10. Which of the following processes represents a gamma- decay only ?

    Text Solution

    |

  11. Select correct statment(s):

    Text Solution

    |

  12. Consider the following nuclear reactions : .(92)^(238)M to (Y)^(X)N+...

    Text Solution

    |

  13. A radioactive element gets spilled over the floor of a room. Its half-...

    Text Solution

    |

  14. The analysis of a uranium reveals that ratio of mole of .^(206)Pband ....

    Text Solution

    |

  15. The ratio of C^(14) to C^(12) in a living matter is measured to be (...

    Text Solution

    |

  16. A solution containing active cobalt 60/27 Co having activity of 0.8 m...

    Text Solution

    |

  17. Wooden article and freshly cut tree show activity 7.6 and 15.2 min""^(...

    Text Solution

    |

  18. C(14) is a beta active nucleus. A sample of C^(14) H(4) gas kept in a ...

    Text Solution

    |

  19. Helium nuclei combines to form an oxygen nucleus. The energy released...

    Text Solution

    |

  20. Let Fpp, Fpn and Fn denote the magnitudes of the net force by a proton...

    Text Solution

    |