Home
Class 12
PHYSICS
4 g of a radioactive substance is kept i...

4 g of a radioactive substance is kept in a store for 15 years. Its half life is 10 years. How much material is decayed?

Text Solution

Verified by Experts

The correct Answer is:
2.585 g
Promotional Banner

Topper's Solved these Questions

  • NUCLEI

    NEW JOYTHI PUBLICATION|Exercise EVALUATION QUESTIONS AND ANSWERS|44 Videos

  • NUCLEI

    NEW JOYTHI PUBLICATION|Exercise CONTINUOUS EVALUATION|2 Videos

  • NUCLEI

    NEW JOYTHI PUBLICATION|Exercise SOLUTIONS TO EXERCISES FROM NCERT TEXT|23 Videos

  • MOVING CHARGES AND MAGNETISM

    NEW JOYTHI PUBLICATION|Exercise COMPETITIVE EXAM CORNER|28 Videos

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    NEW JOYTHI PUBLICATION|Exercise COMPETITIVE EXAM CORNER|26 Videos

Similar Questions

Explore conceptually related problems

The radioactive constant of radium is 4.28 xx 10^(-4) per year, its half period is approximately

Calculate the activity of 1 mg of a radioactive sample whose mass no. is 90 and half life is 28 years.

Ten grams of ^57 Co kept in an open container beta-decays with a half-life of 270 days. The weight of the material inside the container after 540 days will be very nearly

Half life of a radioacitve substance is 4 hours . In how much time 7/8 of the substance would decay?

The half - life of a radioactive substance is 30minutes . The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is:

A radioactive nucleus X converts into stable nucleus Y. Half-life of X is 50 years. Calculate the age of radioactive sample when the ratio of X and Y is 1 : 15.

A radioactive sample has 2.6 mu g of pure ""_(7)^(13)"N" which has a half - life of 10 minutes. (a) How many nuclei are present initially? (b) What is the activity initially? (c) What is the activity after 2 hours? (d) Calculate mean life of this sample.

The half-life of a radioactive substance is 20 minutes. The time taken between 50% decay and 87.5% decay of the substance will be

NEW JOYTHI PUBLICATION-NUCLEI-PRACTICE PROBLEMS FOR SELF ASSESSMENT
  1. Calculate the binding energy of a deutron. Given that mass of proto...

    Text Solution

    |

  2. The binding energy of ""(10)^(20)Ne is 160.6 MeV. Find atomic mass . ...

    Text Solution

    |

  3. Show that the density of nuclear mass is constant for all isotopes.

    Text Solution

    |

  4. Calculate the binding energy per nucleon of ""(79^(197)Au. Mass of Au ...

    Text Solution

    |

  5. Calculate the biding enery per nucleon of ""(24)^(52)Cr which has a ma...

    Text Solution

    |

  6. The mass of ""(17)^(35)Cl is 34.9800 u . Calculate its binding energy ...

    Text Solution

    |

  7. After a certain lapse of time, fraction of radioactive polonium undeca...

    Text Solution

    |

  8. The half life of radioactive element is 8 years. In what time 0.6 g of...

    Text Solution

    |

  9. For every 10^6 atoms of radium in a sample today, find the number of a...

    Text Solution

    |

  10. Find the density of nuclear mass in ""(92)^(238)U. Given R0 = 1.5 ferm...

    Text Solution

    |

  11. Nuclear radius of ""(82)^(205)Pb is 7 fermi. Calculate the nuclear rad...

    Text Solution

    |

  12. A radiactive isotope of ""^(197)Hg decays into ""^(197)Au with a decay...

    Text Solution

    |

  13. A nucleus X1 has a half life of 24 days How long of sample of X1 will ...

    Text Solution

    |

  14. 4 g of a radioactive substance is kept in a store for 15 years. Its ha...

    Text Solution

    |

  15. A certain substance has a half life of 28 hours. Calculate its means l...

    Text Solution

    |

  16. Half life of a radioacitve substance is 4 hours . In how much time 7/8...

    Text Solution

    |

  17. Find the half life of ""(238)U if one gram of ""^(238)U emits 1.24 xx ...

    Text Solution

    |

  18. Calculate the activity of 1 mg of a radioactive sample whose mass no. ...

    Text Solution

    |