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KVPY2019PhysicsNuclear Physics

The nuclear radius is given by R = r 0 A 1 / 3 , where r 0 is constant and A is the atomic mass number. Then, the nuclear mass density of U 238 is

Options

  1. Atwice that of Sn 119
  2. Bthrice that of Sn 119
  3. Csame as that of Sn 119
  4. Dhalf that of Sn 119

Correct answer

C. same as that of Sn 119

Step-by-step solution

Given, nuclear radius is R = r 0 A 1 3 Here, atomic mass number of nucleus = A ∴ Nuclear density d is given by d =  Mass number   Volume  ⇒    d = A 4 3 π R 3 = A 4 3 π r 0 A 1 3 3 ⇒    d = A 4 3 π r 0 3 · A = 3 4 π r 0 3 As r 0 = a constant, so nuclear density is a constant quantity. ∴ Nuclear mass density of U 238 is same as that of Sn 119

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