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Atoms and Nucle...

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  • Question 1
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    Certain radio-active substances reduces to 25% of itsvalue in 16 days. Its half-life is

  • Question 2
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  • Question 3
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    The half-life of a radioactive substance against α–decay is 1.2 × 107 s. What is the decay rate for 4 × 1015 atomsof the substance

  • Question 4
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    A radioactive material has an initial amount 16 g. After 120 days it reduces to 1 g, then the half-life of radioactive material is

  • Question 5
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  • Question 6
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  • Question 7
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    If 92U238undergoes successively 8 α–decays and time6 β–decays, then resulting nucleus is

  • Question 8
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    The activity of a sample of a radioactive material is A at time t1 and A2 at time t2(t2> t1). If its mean life is T, then

  • Question 9
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  • Question 10
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    Which of the following rays are not electromagnetic waves?

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