Home
Class 8
MATHS
A half life is the amount of time that i...

A half life is the amount of time that it takes for a radioactive substance to decay to one half of its original quantity.
Suppose radioactive decay causes 300 grams of a substance to decrease to `300xx2^(-3)` grams after 3 half lives. Evaluate `300xx2^(-3)` to determine how many grams of the substance are left.
Explain why the expresssion `300xx2^(-n)` can be used to find the amount of the substance that remains after n half lives.

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • EXPONENTS AND POWERS

    NCERT EXEMPLAR|Exercise THINK AND DISCUSS|2 Videos

  • DIRECT AND INVERSE PROPORTIONS

    NCERT EXEMPLAR|Exercise THINK AND DISCUSS|2 Videos

  • INTRODUCTION TO GRAPHS

    NCERT EXEMPLAR|Exercise EXERCISE |86 Videos

Similar Questions

Explore conceptually related problems

What percentage of radioactive substance is left after 5 half lives?

A radioactive substance reduces to 1/32 of its original value in 300 days. The half life of radioactive substance is

7/8 of the original mass of a radioactive substance decays in 30 min. What is the half life of the radioactive substance ?

A radioactive substance decays to (3)/(4) th of original value in 2h. The half-life of the substance is

After 20 min, the amount of certai radioactive substance disintegrate was 15/16 original amount. What is the half-life ofg the radioactive substance?

A radioactive substances decays so that 3% of its initial nuclei remain after 60 seconds. The half life period of the substances is nearly

20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

One gram of a radioactive substance of half life 4 days is sealed in a tube. The quantity left after 5 days is

NCERT EXEMPLAR-EXPONENTS AND POWERS-EXERCISE
  1. While studying her family's history. Shikha discovers records of ances...

    Text Solution

    |

  2. About 230 billion litres of water flows through a river each day. How ...

    Text Solution

    |

  3. A half life is the amount of time that it takes for a radioactive subs...

    Text Solution

    |

  4. Consider a radioactive substance. The fraction of its quantity that re...

    Text Solution

    |

  5. One Fermi is equal to 10^(-15) metre. The radius of a proton is 1.3 Fe...

    Text Solution

    |

  6. The paper clip below has the indicated length. What is the length in s...

    Text Solution

    |

  7. .Use the properties of exponents to verify that each statement is true...

    Text Solution

    |

  8. Simplify the following using law of exponents. (3^2)×(3^2)^4.

    Text Solution

    |

  9. There are 864,00 seconds in a day. How many days long is a second? Exp...

    Text Solution

    |

  10. Stretching Machine Suppose you have a stretching machine which coul...

    Text Solution

    |

  11. Find three repeater machines that will do the same work as a (xx64) ma...

    Text Solution

    |

  12. What will the following machine do to a 2 cm long piece of chalk?

    Text Solution

    |

  13. Shrinking Machine In a shrinking machine, a piece of stick is compre...

    Text Solution

    |

  14. Sanchay put a 1 cm stick of gum through a (1xx3^(-2)) machine. How lon...

    Text Solution

    |

  15. Find the single machine that will do the same job as the given hook -u...

    Text Solution

    |

  16. Supply the missing information for each diagram.

    Text Solution

    |

  17. If possible find a hook up of prime base number machine that will do t...

    Text Solution

    |

  18. Find two repeater machines that will do the same work as a (xx81) mach...

    Text Solution

    |

  19. Find a repeater machine that will do the same work as a(xx1/8) machine...

    Text Solution

    |

  20. Find three machines that can be replaced with hook ups of (xx5) machin...

    Text Solution

    |