Home
Class 12
PHYSICS
If 10% of a radioactive material decays ...

If `10%` of a radioactive material decays in 5 days, then the amount of orginal material left after 20 days is approximately

A

`90%`

B

`80%`

C

`65.6%`

D

`50%`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • NUCLEI

    AAKASH SERIES|Exercise Practice Exercise|40 Videos

  • NUCLEI

    AAKASH SERIES|Exercise Exercise-I|79 Videos

  • NUCLEAR PHYSICS

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE PRACTICE SHEET (ADVANCED) Integer Type Questions|3 Videos

  • OPTICAL INSTRUMENTS

    AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE -I) (OPTICAL INSTRUMENTS) (LEVEL-I (MAIN)) (SUBJECTIVE OBJECTIVE TYPE QUESTIONS)|21 Videos

Similar Questions

Explore conceptually related problems

If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately.

20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

If a radioactive material remains 25% after 16 days, then its half life will be

A radioactive material has half-life of 10 days. What fraction of the material would remain after 30 days ?

80 kg of a radioactive material reduces to 10 kg in 1 h. The decay constant of the material is

Three-fourth of a radioactive material decays in 2.5 days. How long will it take for 15//16th of the material to decay? a. 2 days b. 5 days c. 7.5 days d. 10 days

A sample contains 16 gm of radioactive material, the half-life of which is two days. After 32 days, the amount of radioactive material left in the sample is

A certain radioactive element has half-life of 4 days. The fraction of material that decays in 2 days is

If 10% of a radioactive substance decays in every 5 year, then the percentage of the substance that will have decaed in 20 years will be .

If 10% of a radioactive substance decays in every 5 year, then the percentage of the substance that will have decaed in 20 years will be .

AAKASH SERIES-NUCLEI-Exercise-II
  1. Half-life of a radioactive substance is 12.5 h and its mass is 256 g. ...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  5. The activity of a radioactive element decreased to one - third of orig...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  9. The sample of a radioactive substance has 10^6 nucei. Its half life is...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  12. Tritium has a half-life of 12.5 y undergoing beta decay. What fraction...

    Text Solution

    |

  13. A freshly prepared radioactive source of half-life 2 h emits radiation...

    Text Solution

    |

  14. If 10% of a radioactive material decays in 5 days, then the amount of ...

    Text Solution

    |

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

    Text Solution

    |

  16. 200 Mev energy is released when one nucleus of .^235U undergoes fissio...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  20. An explosion of atomic bomb release an energy of 7.6 xx 10^13J. If 200...

    Text Solution

    |