Home
Class 12
PHYSICS
A radio - active element has half -...

A radio - active element has half - life of 15 years. What is the fractional that will decay in 30 years ?

A

0.85

B

0.25

C

0.5

D

0.75

Text Solution

Verified by Experts

The correct Answer is:
0.75
Promotional Banner

Topper's Solved these Questions

  • MODEL TEST PAPER 9

    KCET PREVIOUS YEAR PAPERS|Exercise Physics|60 Videos

  • SOLVED PAPER 04

    KCET PREVIOUS YEAR PAPERS|Exercise PHYSICS|60 Videos

Similar Questions

Explore conceptually related problems

Radioactive element has a half life of 25 minutes. Calculate the fraction of element that has decayed in 60 minutes.

A radioactive element has half-life period 1600 years. After 6400. years what amount will remain ?

A radioisotope has a half life of 5 years. The fraction of the atoms of this meterial that would decay in 15 years will be

A radioactive sample has ,a half life of 10 days. What is its disintegration constant? What is its mean life?

A radioactive element has a half life of one day. After three days, the amount of element left will be:

A radioactive element has a half life of 20 days . What amount would be left after 80 days , if the original amount was 8 g?

A radioactive substance has a half-life of 60 minutes. During 3 hours the fraction of atom that have decayed would be

A radioactive sample has half life of 1500 years. A sealed tube containing 1 g of a sample will contain ... g of the sample after 3000 years. The missing figure is :

A radioactive substance has half life of 60 minutes. During 2 hours, the fraction of the sample that have decayed would be

KCET PREVIOUS YEAR PAPERS-PHYSICS-MCQs
  1. The period of revolution of an electron revolving in n^(th) orbi...

    Text Solution

    |

  2. Angular momentum of an electron in hydrogen atom is (3h)/(2 pi)...

    Text Solution

    |

  3. A radio - active element has half - life of 15 years. What is th...

    Text Solution

    |

  4. Two protones are kept at a separation of 10 nm. Let F(n) and F(e) b...

    Text Solution

    |

  5. During a beta - decay

    Text Solution

    |

  6. A positive hole in a semiconductor is

    Text Solution

    |

  7. A 220 V A. C supply is connected between points A and B as shown ...

    Text Solution

    |

  8. In the following circuit what are P and Q :

    Text Solution

    |

  9. A body is intially at rest . It undergos one -dimensional motion ...

    Text Solution

    |

  10. A thin uniform rectangular plate of mass 2 kg is placed X - Y pl...

    Text Solution

    |

  11. One end of a string of length 'l' is connected to a particle of m...

    Text Solution

    |

  12. Young 's modulus of a perfect rigied body is

    Text Solution

    |

  13. A wheel starting from rest gains an angular velcoity of 10 rad/s ...

    Text Solution

    |

  14. Iceberg floats in water with part of it submerged. What is the frac...

    Text Solution

    |

  15. The value of acceleartion due to gravity at a height of 10 km fr...

    Text Solution

    |

  16. In an adiabatic expansion of an ideal gas the product of pressure an...

    Text Solution

    |

  17. A certain amount of heat energy is supplied to a monoatomic idea...

    Text Solution

    |

  18. A sphere, a cube and a thin circular plate all of same material a...

    Text Solution

    |

  19. A thin unifrom reactangular plate of mass 2 kg placed in X - Y pla...

    Text Solution

    |

  20. One end of a string of length 'l' is connected to a particle of m...

    Text Solution

    |