Home
Class 12
PHYSICS
A radioactive substance has an average l...

A radioactive substance has an average life of `5` hours. In a time of `5` hours

A

Less than half of the active nuclei decay

B

More than half of the active nuclei decay

C

Half of the active nuclei decay

D

All active nuclei decay

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • NUCLEI

    AAKASH INSTITUTE ENGLISH|Exercise Assignment Section B Objective (One option is correct )|10 Videos

  • NUCLEI

    AAKASH INSTITUTE ENGLISH|Exercise Assignment Section C Objective (More than one option are correct )|10 Videos

  • NUCLEI

    AAKASH INSTITUTE ENGLISH|Exercise Try Yourself|36 Videos

  • MOVING CHARGES AND MAGNETISM

    AAKASH INSTITUTE ENGLISH|Exercise Assignment Section J (Aakash Challengers Questions)|5 Videos

  • OSCILLATIONS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section D) (ASSERTION-REASON TYPE QUESTIONS)|13 Videos

Similar Questions

Explore conceptually related problems

A: A radioactive substance has half life of 4 hour. Therefore, if two nuclei of the substance are present initially , after 1 hour only one will remain undissociated. R: When a nucleus makes a transition from excited state to ground state, it emits a beta -particle.

A certain radioactive substance has a half life of 5 years. Thus for a nucleus in a sample of the element, probability of decay in 10 years is

The initial concentration of a radioactive substance is No and its half life is 12 hours. What will be its concentration after 36 hours?

If 8.0 g of radioactive isotope has a half life of 10 hours, the half life of 2.0 g of the same substance is

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

(a) Differentiate between half-life and average life of a radioactive substance. (b) A radioactive substance decays for an interval of time equal to its mean life. Find the fraction of the amount of the substance which is left undecayed after this time interval.

If 3//4 quantity of a radioactive substance disintegrates in 2 hours, its half - life period will be

A certain radioactive substance has a half-life period of 30 days. What is the disintegration constant ?

If 9.0 g of a radioactive isotope has a half life period of 10 hrs. The half life period of 3.0 g of the same substance is:

A 300 gram radioactive sample has life of 3 hour's. After 18 hours, remaining quantity will be:

AAKASH INSTITUTE ENGLISH-NUCLEI-Assignment Section A Objective (One option is correct )
  1. Beta rays emitted by a radicactive material are

    Text Solution

    |

  2. Alpha rays emitted from a radioactive substance are

    Text Solution

    |

  3. In a given reaction, ""(Z)X^(A)to(Z+1)Y^(A)to(Z-1)K^(A-4)to(Z-1)K^(A...

    Text Solution

    |

  4. The radioactivity of a certain radioactive elements drops to 1/(64) ...

    Text Solution

    |

  5. If the half life of a radioactive is T. then the fraction that would r...

    Text Solution

    |

  6. The half-life of a radioactive element which has only 1//32 of its ori...

    Text Solution

    |

  7. The half-life of Bi^210 is 5 days. What time is taken by (7//8)^th par...

    Text Solution

    |

  8. A radioactive nucleus undergoes a series of decay according to the sch...

    Text Solution

    |

  9. Half-life of radioactive element depend upon

    Text Solution

    |

  10. The half-life period of a radioactive substance is 5 min. The amount o...

    Text Solution

    |

  11. Half-lives of two radioactive substances A and B are respectively 20 m...

    Text Solution

    |

  12. Half-life of a radioacitve element is 10 days. The time during which q...

    Text Solution

    |

  13. An element A decays into an element C by a two step process A to B + ....

    Text Solution

    |

  14. During mean life of a radioactive element, the fraction that disintegr...

    Text Solution

    |

  15. The half-life of a radioactive substance against alpha-decay is 1.2 xx...

    Text Solution

    |

  16. The activity of a sample of radioactive material is R(1) at time t(1)a...

    Text Solution

    |

  17. A radioactive substance has an average life of 5 hours. In a time of 5...

    Text Solution

    |

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

    Text Solution

    |

  19. The half-life of a sample of a radioactive substance is 1 h. If 8xx10^...

    Text Solution

    |

  20. A nucleus of mass 220 amu in the free state decays to emit an alpha-pa...

    Text Solution

    |