Home
Class 12
PHYSICS
Certain radioactive substance reduces to...

Certain radioactive substance reduces to 25% of its value in 16 days. Its half-life is

A

`32 days`

B

`8 days`

C

`64 days`

D

`28 days`

Text Solution

Verified by Experts

The correct Answer is:
b
`(N_(0))/(4)=(N_(0))/(2n) rArr n=2`
Thus, 1`0 days =2 `half-lives
`:. Half-life =8 days`.
Promotional Banner

Topper's Solved these Questions

  • NUCLEAR PHYSICS

    CENGAGE PHYSICS ENGLISH|Exercise Linked Comprehension|29 Videos

  • NUCLEAR PHYSICS

    CENGAGE PHYSICS ENGLISH|Exercise Integer|6 Videos

  • NUCLEAR PHYSICS

    CENGAGE PHYSICS ENGLISH|Exercise Subjective|35 Videos

  • MISCELLANEOUS VOLUME 5

    CENGAGE PHYSICS ENGLISH|Exercise Integer|12 Videos

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Integer Type|4 Videos

Similar Questions

Explore conceptually related problems

Ceratain radioactive substance reduces to 25% of its value is 16 days . Its half-life is

A radioactive element reduces to 25% of its initial value in 1000 years. What is half-life of the element ?

A radioactive substance decays to 1//16^(th) of its initial mass in 40 days. The half life of the substance, in days, is :

The radioactivity of a certain radioactive element drops to 1//64 of its initial value in 30 seconds. Its half-life is.

Every 8 days a mass of a certain radioactive substance decreases to exactly one-half of its value at the beginning of the 8day period. If the initial amount of the radioactivce substance is 75 grams, which equation gives the number of grams in the mass, M,that remains after d days?

A radioactive element reducess to 32st of its initial value in 1000 years . What is half life of the element ?

A sample of a radioactive substance undergoes 80% decomposition in 345 minutes. Its half life is …………minutes

Activity of a radioactive substance decreases from 8000 Bq to 1000 Bq in 9 days. What is the half-life and average life of the radioactive substance?

16 g of a radio active substance is reduced to 0.5 g after 1 hour. The half life of the radioactive substance in minutes is

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

CENGAGE PHYSICS ENGLISH-NUCLEAR PHYSICS-Single Correct Option
  1. Neutron decay in the free space is given follows: .0n^1 rarr. 1H^1 +...

    Text Solution

    |

  2. A nucleus .Z^AX emits an alpha-particel. The resultant nucleus emits ...

    Text Solution

    |

  3. Certain radioactive substance reduces to 25% of its value in 16 days....

    Text Solution

    |

  4. What is the age of an ancient wooden piece if it is known that the spe...

    Text Solution

    |

  5. A helium atom, a hydrogen atom and a neutron have mases of 4.003 u, 1....

    Text Solution

    |

  6. A certain radioactive element has half-life of 4 days. The fraction o...

    Text Solution

    |

  7. In the disintegration series .(92)^(238)U overset rarr (alpha) X ...

    Text Solution

    |

  8. Atomic mass number of an element is 232 and its atomic number is 90. T...

    Text Solution

    |

  9. The initial activity of a certain radioactive iostope was measured as ...

    Text Solution

    |

  10. The minimum frequency of a gamma-ray that causes a deutron to disinteg...

    Text Solution

    |

  11. The fission of a heavy nucleus gives, in general, two smaller nuclei, ...

    Text Solution

    |

  12. The activity of a radioactive sample is 1.6 curie, and its half-life i...

    Text Solution

    |

  13. The rest mass of the deutron .(1)^(2) H is equivalent ot an energy of ...

    Text Solution

    |

  14. A newly prepared radioactive nuclide has a decay constant lambda of 10...

    Text Solution

    |

  15. The half-life of a certain radioactive isotope is 32 h.What fraction o...

    Text Solution

    |

  16. Samples of two radioactive nuclides, X and Y, each have equal activity...

    Text Solution

    |

  17. A sample of radioactive element has a mass of 10 g at an instant t=0. ...

    Text Solution

    |

  18. In the case of thorium (A=232 and Z=90), we obtain an isotope of lead...

    Text Solution

    |

  19. After an interval of one day , 1//16th initial amount of a radioactiv...

    Text Solution

    |

  20. The half-life of .^215At is 100mus. The time taken for the activity of...

    Text Solution

    |