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Atoms and Nucle...

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  • Question 1
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    A radioactive sample S1 having the activity A1 has twice the number of nuclei as another sample S2 of activity A2. If A2 = 2A1, then the ratio of half - life of S1 to the half - life of S2 is

  • Question 2
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    When a neutron is disintegrated to give a β -particle,

  • Question 3
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    How many neutrons are more than protons in 92U235 nucleus?

  • Question 4
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    If the decay constant of a radioactive substance is λ, then its half - life is

  • Question 5
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    The half-life period of a radioactive substance is 3 days. Three fourth of substance decays in

  • Question 6
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    A radioactive material decays by simultaneous emission of two particles with half-lifes 1620 yr and 810 yr, respectively. The time in year after which one-fourth of the material remains, is

  • Question 7
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    The proper life of point (π+) is 2.5 × 10-8 s. In a beam of pions travelling with a speed of 0.9c, the pion in the laboratory frame can travel a maximum distance of

  • Question 8
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    One Becquerel is defined as

  • Question 9
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    During the β- decay

  • Question 10
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    The half - life of At215 is 100 μs. If a sample contains 215 mg of At215, the activity of the sample initially is

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