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The radius of an atomic nucleus of mass number is fermi. Then the mass number of another atomic nucleus of radius fermi is
(a)
(b)
(c)
(d)

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Important Questions on Structure of Atoms and Nuclei
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The energy equivalent to a substance of mass is

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HARD

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(velocity of light, is )

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Initial mass of is gram. After what time gram of it will be disintegrated?

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