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Atoms, Nuclei &...

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  • Question 1
    1 / -0.25

    What percentage of the mass of an atom is concentrated in the nucleus?

  • Question 2
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    In the mass number range A = 30 to 170, the binding energy per nucleon is

  • Question 3
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    Plutonium decays with a half-life of 24000 years. If the plutonium is stored for 72000 years, then the fraction of plutonium that remains is    

  • Question 4
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    In a nuclear reaction which of the following is conserved

  • Question 5
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    Cadmium rods are used in a nuclear reactor for

  • Question 6
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    In what units is mass measured on the atomic scale?

  • Question 7
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    Energies associated with nuclear processes are

  • Question 8
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    B210 has a half life of 5 days. The time taken for seven-eighth of a sample to decay is

  • Question 9
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    If 10% of a substance decays in 10 days, then approximate percentage of substance left after 24 days is

  • Question 10
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    Choose the WRONG statement. A thermonuclear fusion reactor is better than a fission reactor for the following reason:

  • Question 11
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    A free neutron decays into

  • Question 12
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    The disintegration energy is

  • Question 13
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    A radioactive substance has a half life of four months. Three fourths of the substance will decay in

  • Question 14
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    At a given time there are 25% undecayed nuclei in a sample. After 10 seconds number of undecayed nuclei reduces to 12.5%. Then mean life of the nuclei will be about

  • Question 15
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    Which of the following particles can be added to the nucleus of an atom without changing its chemical properties?

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