Home
Class 12
CHEMISTRY
After 24 hours, only 0.125 g out of the ...

After 24 hours, only 0.125 g out of the initial quantity of 1g of a radioisotope remains behind. what is half-life period?

Text Solution

Verified by Experts

`N_(0)` N=0.125 g ,t=24 hours
`therefore lambda =(2.303)/(t)log(N_(0))/(N)`
`=(2.303)/(24) log (1)/(0.25)`
`therefore t^(1//2) =(0.693)/(lambda)=(0.639)/(0.866)=7.99` hours
Promotional Banner

Topper's Solved these Questions

  • NUCLEAR CHEMISTRY

    NCERT TAMIL|Exercise PRACTICE PROBLEMS|2 Videos

  • NUCLEAR CHEMISTRY

    NCERT TAMIL|Exercise SELF EVALUATION|26 Videos

  • ISOMERISM IN ORGANIC CHEMISTRY

    NCERT TAMIL|Exercise SELF EVALUATION (GEOMETRICAL ISOMERISM(Practice Question))|5 Videos

  • ORGANIC NITROGEN COMPOUNDS

    NCERT TAMIL|Exercise EVALUATION (Choose the correct answer)|24 Videos

Similar Questions

Explore conceptually related problems

The fraction of the radioactive sample will remain undecayed after 4 half-life periods is

Which is the radioactive element in group 1 element? What is its half-life period?

After a certain lapse of time, fraction of radioactive polonium undecayed is found to be 12.5% of the initial quantity. What is the duration of this time lapsed if the half life of polonium is 138 days?

Counting rate from a radioactive source is 8000 cts per sec. at time t = 0 and after 10 minutes decay is 1000 cts/sce. Calculate (i) half life period, (ii) decay constant and (iii) counting rate after 20 minutes.

Compound A reacts by first order kineties. At 25^(@)C , the rate constant of the reaction is 0.60 sec^(-1) . What is the half life of A ?

In a first order reaction x rarr y , if k is the rate constant and the initial concentration of the reactant x is 0.1 M, then, the half life is

A and B are two separate reservoirs of water. Capacity of reservoir A is double the capacity of reservoir Bdot Both the reservoirs are filled completely with water, their inlets are closed and then the water is released simultaneously from both the reservoirs. The rate of flow of water out of each reservoir at any instant of time is proportional to the quantity of water in the reservoir at the time. One hour after the water is released, the quantity of water is reservoir A is 1 1/2 times the quantity of water in reservoir Bdot After how many hours do both the reservoirs have the same quantity of water?

NCERT TAMIL-NUCLEAR CHEMISTRY-SELF EVALUATION
  1. After 24 hours, only 0.125 g out of the initial quantity of 1g of a ra...

    Text Solution

    |

  2. The phenomenon of radioactivity was discovered by

    Text Solution

    |

  3. The most penetrating radiations are

    Text Solution

    |

  4. In the nuclear reaction, 92^(X^(232))rarr 89^(Y^(220)), the number of ...

    Text Solution

    |

  5. Which one of the following particles is used to bombard 13^(Al^(27)) t...

    Text Solution

    |

  6. Radioactivity is due to

    Text Solution

    |

  7. In the nuclear reaction, 92^(X^(232))rarr 89^(Y^(220)), the number of ...

    Text Solution

    |

  8. 92^(U^(235)) nucleus absorbs a neutron and disintegrates into 54^(Xe^(...

    Text Solution

    |

  9. Assertion: The ionision power of beta-particle is less compared to alp...

    Text Solution

    |

  10. Which of the following is used as a moderator and coolant in nuclear r...

    Text Solution

    |

  11. What is half life period.

    Text Solution

    |

  12. Write two difference between chemical reaction and nuclear reaction.

    Text Solution

    |

  13. Why do you mean be Q value of nuclear reaction ?

    Text Solution

    |

  14. What are the types of nuclear reaction. Give example for each type.

    Text Solution

    |

  15. What is Radio carbon dating?

    Text Solution

    |

  16. What is binding energy of a nucleus? Give its expression.

    Text Solution

    |

  17. What is nuclear fusion? How do nuclear fusion reactions differ from fi...

    Text Solution

    |

  18. What is thermo chemical reactions?

    Text Solution

    |

  19. Explain the uses of radio isotopes in medicine field.

    Text Solution

    |

  20. How many alpha and beta particles will be emitted by an element 84^(A^...

    Text Solution

    |

  21. Calculate the decay constant for Ag^(108) if its half life is 2.31 min...

    Text Solution

    |