Home
Class 12
PHYSICS
A radio - active sample of half- life 10...

A radio - active sample of half- life 10 days contains 1000 x nuclei . Number of original nuclie present after 5 days is

A

707x

B

750x

C

500x

D

250x

Text Solution

Verified by Experts

The correct Answer is:
A
`N=(N_(0))/(2^(n))`
Here `n=(1)/(2)` and `N_(0)=1000x`
`therefore N=(1000x)/(2^((1)/(2)))=(1000x)/(sqrt(2))=0.707xx1000x`
`N=707x`
Promotional Banner

Topper's Solved these Questions

  • K - CET - PHYSICS - 2018

    SUNSTAR PUBLICATION|Exercise MCQs|60 Videos

  • K-CET-PHYSICS-2014

    SUNSTAR PUBLICATION|Exercise MCQs|60 Videos

Similar Questions

Explore conceptually related problems

A radioactive sample of half life T_((1)/(2)) contains 1000 nuclei. How many members will be left after a time t=(T//8) ?

A sample of radioactive element contains 4 xx 10^16 active nuclei. Half life of element is 10 days, then the number of decayed nuclei after 30 days is

A radioactive sample has a half-life of 10 minutes. If 64 nuclei are contained in the sample the number of nuclei that would decay after 50 minutes is

A radioactive sample has ,a half life of 10 days. What is its disintegration constant? What is its mean life?

A radioactive substance contains 10,000 nuclei and its half life period is 20 days. The number of nuclei present at the end of 10 days is

A radioactive substance contains 10, 000 nuclei and its half - life period is 20 days.The number of nuclei present at the end of 10 days is

SUNSTAR PUBLICATION-K-CET-PHYSICS - 2016-MCQs
  1. In a series LCR circuit , the potential drop across L, C and R respect...

    Text Solution

    |

  2. In a series LCR circuit , and alternating emf (v) and current (i) are ...

    Text Solution

    |

  3. Electromagnetic radiation used to sterilise milk is

    Text Solution

    |

  4. A plane glass plate is placed over a various coloured letters ( violet...

    Text Solution

    |

  5. A ray of light passes through four transparent media with refractive i...

    Text Solution

    |

  6. Focal length of a convex lens is 20 cm and its RI is 1.5. it prodcued ...

    Text Solution

    |

  7. A ray of light suffers a minimum deviation when incident on a equilate...

    Text Solution

    |

  8. In Young.s double slit experiment the source is white light. One slit ...

    Text Solution

    |

  9. Light of wavelength 600nm is incident normally on a slit of width 0.2 ...

    Text Solution

    |

  10. for what distance is ray optics os good approximation when the apertur...

    Text Solution

    |

  11. The variation of photo-current with collector potential for different ...

    Text Solution

    |

  12. The de Brogle wavelength of an electron accelrated to a potential of 4...

    Text Solution

    |

  13. Total energy of electron in an excited state of hydrogen atom is -3.4e...

    Text Solution

    |

  14. When electron jumps from n = 4 level to n = 1 level , the angular mome...

    Text Solution

    |

  15. A radio - active sample of half- life 10 days contains 1000 x nuclei ....

    Text Solution

    |

  16. An element X decays into element Z by two-step process. XrarrY+""(2)...

    Text Solution

    |

  17. A nucleus of amss 20 u emits a gamma photon of energy 6 MeV . If the e...

    Text Solution

    |

  18. Cosntant DC voltage is required from a variable AC voltage . Which of ...

    Text Solution

    |

  19. In a transistor , the collector current varies by 0.49mA and emitter c...

    Text Solution

    |

  20. Identify the logic operation carried out by the following circuit.

    Text Solution

    |