Home
Class 12
PHYSICS
Half-lives of two radioactive substances...

Half-lives of two radioactive substances `A` and `B` are respectively `20` minutes and `40` minutes. Initially, he sample of `A` and `B` have equal number of nuclei. After `80` minutes the ratio of the remaining number of `A` and `B` nuclei is :

A

`1:4`

B

`1:2`

C

`1:1`

D

`1:8`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • NUCLEI

    AAKASH INSTITUTE|Exercise ASSIGNMENT (SECTION-A)|39 Videos

  • NUCLEI

    AAKASH INSTITUTE|Exercise ASSIGNMENT (SECTION-B)|27 Videos

  • NUCLEI

    AAKASH INSTITUTE|Exercise EXAMPLE|43 Videos

  • MOVING CHARGES AND MAGNETISM

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

  • OSCILLATIONS

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

Similar Questions

Explore conceptually related problems

Half-life of a radioactive substance A and B are, respectively, 20 min and 40min . Initially, the samples of A and B have equal number of nuclei. After 80 min , the ratio of the ramaining number of A and B nuclei is

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be :

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be

Half lives of two radioactive nuclei A and B are 10 minutes and 20 minutes, respectively. If, initially a sample has equal number of nuclei, then after 60 minutes, the ratio of decayed numbers of nuclei A and B will be:

Two radioactive substances A and B have half lives of T and 2T respectively. Samples of a and b contain equal number of nuclei initially. After a time 4T , the ratio of the number of undecayed nuclei of A to the number if undecayed nuclei of A to the number of undeacyed nuclei of B is

Two radioactive elements X and Y half-live pf 50 and 100 minute respectiv ely. Intial sample of both the elements have same number of atoms. The ratio of the reamaining number of atoms of X and Y after 20 minute is:

There are two radioactive substance A and B . Decay consant of B is two times that of A . Initially, both have equal number of nuceli. After n half-lives of A ,rates of disintegaration of both are equal. The value of n is .

Two radioactive substances have half-lives T and 2T. Initially, they have equal number of nuclei. After time t=4T , the ratio of their number of nuclei is x and the ratio of their activity is y. Then,

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

AAKASH INSTITUTE-NUCLEI-EXERCISE
  1. Size of nucleus is of the order of

    Text Solution

    |

  2. The masses of neutron and proton are 1.0087 a.m.u. and 1.0073 a.m.u. r...

    Text Solution

    |

  3. The binding energy of deuteron .1^2 H is 1.112 MeV per nucleon and an ...

    Text Solution

    |

  4. Two nucleons are at a separation of 1 xx 10^-15 m. The net force betwe...

    Text Solution

    |

  5. The average kinetic energy of the thermal neutron is of the order of

    Text Solution

    |

  6. In a fission process, nucleus A divides into two nuclei B and C, their...

    Text Solution

    |

  7. Radius of .2^4HeThe nucleus is 3 Fermi. The radius of .16^32S nucleus ...

    Text Solution

    |

  8. 1 atomic mass unit is equal to

    Text Solution

    |

  9. Binding energy per nucleon curve as a function of atomic mass number ...

    Text Solution

    |

  10. If m,mn and mp are masses of .Z X^A nucleus, neutron and proton respec...

    Text Solution

    |

  11. A nucleus of .84^210 Po originally at rest emits alpha particle with s...

    Text Solution

    |

  12. A reactor is generating 1000 kW of power and 200 MeV of energy may be ...

    Text Solution

    |

  13. The number of neutrons released when .92 U^235 undergoes fission by ab...

    Text Solution

    |

  14. If T is the half-life of a radioactive material, then the fraction tha...

    Text Solution

    |

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

    Text Solution

    |

  16. The particles emitted in the nuclear reaction are respectively - .(...

    Text Solution

    |

  17. The activity of a sample of a radioactive meterial is A1 , at time t1 ...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  20. The control rod in a nuclear reactor is made of

    Text Solution

    |