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Atoms, Nuclei &...

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  • Question 1
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    Relation between atomic number (Z), neutron number (N) and mass number (A) is

     

  • Question 2
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    α-rays are

     

  • Question 3
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    The half life of radon is 3.8 days. After how many days will only one twentieth of a radon sample be left over?

     

  • Question 4
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    90% of a radioactive sample is left undisintegrated after time τhas elapsed, what percentage of initial sample will decay in a total time 2τ ?

     

  • Question 5
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    The average number of neutrons released by the fission of one uranium atom is

     

  • Question 6
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    The nuclei of isotopes of a given element contain the same number of

     

  • Question 7
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    β-rays and γ-rays are respectively

     

  • Question 8
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    Nuclear fusion is possible

     

  • Question 9
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    What is the main source of energy of the sun?

     

  • Question 10
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    All nuclides with same mass number A are called

     

  • Question 11
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    When a hydrogen bomb explodes, which of the following is used?

     

  • Question 12
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    The half-life T1/2 of a radionuclide is

     

  • Question 13
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    A radioactive material decays by simultaneous emission of two particles with respective half lives 1620 and 810 years. The time in years, after which one fourth of the material remains is

     

  • Question 14
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    The chemical behavior of an atom depends upon

     

  • Question 15
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    Nuclear mass M is found to be

     

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