Home
Class 12
PHYSICS
In the chemical analysis of a rock the m...

In the chemical analysis of a rock the mass ratio of two radioactive isotopes is found to be 100:1. The mean lives of the two isotopes are `4xx10^9 `years and` 2xx10^9` years, respectively. If it is assumed that at the time of formation the atoms of both the isotopes were in equal propotional, calculate the age of the rock. Ratio of the atomic weights of the two isotopes is 1.02:1.

Promotional Banner

Topper's Solved these Questions

  • Radioactivity

    MODERN PUBLICATION|Exercise EXERCISE|71 Videos

  • Polarisation of Light

    MODERN PUBLICATION|Exercise EXERCISE|50 Videos

  • REFLECTION OF LIGHT

    MODERN PUBLICATION|Exercise EXERCISE|57 Videos

Similar Questions

Explore conceptually related problems

Two molecules of a gas have speeds of 9 xx 10^6 rms^-1 and 1 xx 10^6 ms^-1 , respectively. What is the root mean square speed of these molecules?

Chlorine has two isotopes "_17^35Cl And "_17^37Cl in the ratio 3:1 . Calculate the average atomic mass of chorine.

Two radioactive nuclei X and Y initially contain an equal number of atoms.Their half life is 1 hour and 2 hours respectively.Calculate ratio of their rates of disintegration after two hours.

Two particles of equal masses are revolving in circular paths of radii r_1 and r_2 respectively with the same time period .The ratio fo the centripetal force is :

Two different radioactive elements with half-lives T_1 and T_2 and N_1 and N_2 (undecayed) atoms respectively present at a given instant. Determine the ratio of their activities at this instant.

A radioactive isotope X with half-life of 693xx10^(9) years decay to Y which is stable. A sample of rock from of the moon was found to contain both the elements X Y in the mole ratio 1:7 . What is the age of the rock ? a) 2.079xx10^(12) years b) 1.94xx10^(10) years c) 1.33xx10^(9) years d) 10^(10) years

Two masses of 1g and 9 g are moving with equal kinetic energies. The ratio of the magnitudes of their respective linear momentum is

Two point charges 4Q and Q are separated by a distance of 1 m in air. Also calculate the electrostatic potential energy of the system of two charges, taking Q = 2 xx 10^-7C .

A wire stretched between two rigid supports vibrates in itsfundamental mode with a frequency of 45 Hz. The mass of the wire is 3.5 xx 10^-2 kg and itslinear mass density is 4.0 xx 10^-2 kg m^-1 . What is the tension in the string?

A wire stretched between two rigid supports vibrates in itsfundamental mode with a frequency of 45 Hz. The mass of the wire is 3.5 xx 10^-2 kg and itslinear mass density is 4.0 xx 10^-2 kg m^-1 . What is the speed of a transverse wave on the string

MODERN PUBLICATION-Radioactivity-EXERCISE
  1. In the chemical analysis of a rock the mass ratio of two radioactive i...

    Text Solution

    |

  2. What is meant by radioactive substance?

    Text Solution

    |

  3. What is radioactivity ? State laws of radioactive decay and deduce an ...

    Text Solution

    |

  4. State the law of radioactive decay. Show that radioactive decay is exp...

    Text Solution

    |

  5. State the law of radioactive decay, If N0 is the number of radioactive...

    Text Solution

    |

  6. Show that decay rate R of a sample of a radio-nuclide is related to th...

    Text Solution

    |

  7. State the law of radioactive decay and hence derive the relation N=N0e...

    Text Solution

    |

  8. State the law of radioactive decay and hence derive the relation N=N0e...

    Text Solution

    |

  9. Sketch a graph to illustrate radioactive decay.

    Text Solution

    |

  10. What is meant by half life of a radioactive substance? Derive expressi...

    Text Solution

    |

  11. What is radioactivity ? State laws of radioactive decay and deduce an ...

    Text Solution

    |

  12. An isotope (92)U^(238) decays successively to form (90)Th^(234),(91)P...

    Text Solution

    |

  13. Define decay constant of a radioactive sample. Which of the following ...

    Text Solution

    |

  14. Define decay constant of a radioactive sample. Which of the following ...

    Text Solution

    |

  15. Define decay constant of a radioactive sample. Which of the following ...

    Text Solution

    |

  16. Define decay constant of a radioactive sample. Which of the following ...

    Text Solution

    |

  17. The rate constant and half life of a first order reaction are related...

    Text Solution

    |

  18. State the law of radioactive decay. Show that radioactive decay is exp...

    Text Solution

    |

  19. State the law of radioactive decay. Show that radioactive decay is exp...

    Text Solution

    |

  20. Define half life of a radioactive substance.

    Text Solution

    |

  21. What is radioactivity ? State laws of radioactive decay and deduce an ...

    Text Solution

    |