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Atoms and Nucle...

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  • Question 1
    4 / -1

    Radioactive substances do not emit

  • Question 2
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    In a radioactive substance at t = 0, the number of atoms is 8 × 104. Its half life period is 3 years. The number of atoms 1 × 104 will remain after interval

  • Question 3
    4 / -1

    Some radioactive nucleus may emit

  • Question 4
    4 / -1

    Which can pass through 20 cm thickness of the steel

  • Question 5
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    What percentage of original radioactive atoms is left after five half lives

  • Question 6
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    Alpha rays emitted from a radioactive substance are

  • Question 7
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    Half life of Bi210 is 5 days. If we start with 50,000 atoms of this isotope, the number of atoms left over after 10 days is

  • Question 8
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    A nucleus of atomic mass A and atomic number Z emits β - particles. The atomic mass and atomic number of the resulting nucleus are

  • Question 9
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    The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 sec. Its half life is

  • Question 10
    4 / -1

    The decay constant λ of the radioactive sample is the probability of decay of an atom in unit time, then

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