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Atoms and Nucle...

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  • Question 1
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    Which of the following is in the increasing order for penetrating power?

  • Question 2
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    The half life of a radioactive element which has only 1/32 of its original mass left after a lapse of 60 days is

  • Question 3
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    The half-life of Bi210 is 5 days. What time is taken by (7 /8)th part of the sample to decay

  • Question 4
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  • Question 5
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    The electron emitted in beta radiation originates from

  • Question 6
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    If half life of a radio isotope is 2 seconds and number of atoms are only 4, then after one half life remaining (without decay) atoms are probably

  • Question 7
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    A sample contains 16 g of a radioactive material, the half life of which is two days. After 32 days, the amount of radioactive material left in the sample is

  • Question 8
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    Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be

  • Question 9
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    The half life of polonium is 140 days. After how many days, 16 g polonium will be reduced to 1 g (or 15 g will decay)?

  • Question 10
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    An archaeologist analyses the wood in a prehistoric structure and finds that C14( Half life = 5700 years) to C12 is only one-fourth of that found in the cells of buried plants. The age of the wood is about

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