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Atoms, Molecule...

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  • Question 1
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    A freshly prepared radioactive source of half-life 2 hours emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

  • Question 2
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    Consider α particles, β particles and γ rays, each having energy of 0.5 MeV. In the increasing order of penetrating power, the radiations are

  • Question 3
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    In the fission of one part of uranium, if 0.5 gm mass is decayed, then how much energy (in kWh) will be obtained?

  • Question 4
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    Assertion (A): Nuclear forces arise from strong Coulombic interactions between protons and neutrons.
    Reason (R): Nuclear forces are independent of the charge of the nucleons.

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