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Atoms and Nucle...

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  • Question 1
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    What fraction of a radioactive material will get disintegrated in a period of two half-lives

  • Question 2
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    234U has 92 protons and 234 nucleons total in its nucleus. It decays by emitting an alpha particle. After the decay it becomes

  • Question 3
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    During negative β–decay

  • Question 4
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    A radioactive nucleus emits a beta particle. The parent and daughter nuclei are

  • Question 5
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    99% of a radioactive element will decay between

  • Question 6
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    The masses of two radioactive substances are same and their half lives are 1 year and 2 years respectively. The ratio of their activities after 6 years will be

  • Question 7
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    In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life

  • Question 8
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    The S.I. unit of radioactivity is

  • Question 9
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    Half-life of a substance is 10 years. In what time, it becomes 1/4 th part of the initial amount

  • Question 10
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    If N0 is the original mass of the substance of half-life period T1/2 = 5 years, then the amount of substance left after 15 years is

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