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COMEDK20269 May 2026Morning ShiftPhysicsNuclear PhysicsActual

A nucleus of uranium-235 absorbs a slow neutron and undergoes nuclear fission according to the reaction: ²³⁵₉₂U + ¹₀n ¹⁴¹₅₆Ba + ⁹²₃₆Kr + 3 ¹₀n + Q If the average energy released per fission is 202 MeV, the energy released when 2.35 g of U²³⁵ undergoes complete fission is approximately; [Given 1eV = 1.6 10⁻¹⁹ J , Avogadro number = 6.02 10²³ ]

Options

  1. A1.945 10¹² J
  2. B19.45 10¹² J
  3. C19.45 10¹⁰ J
  4. D1.945 10¹⁰ J

Correct answer

C. 19.45 10¹⁰ J

Step-by-step solution

Number of moles of U²³⁵ = 2.35 235 = 0.01 mol Number of atoms of U²³⁵ = 0.01 6.02 10²³ = 6.02 10²¹ Energy released per fission = 202 MeV = 202 10^6 1.6 10⁻¹⁹ J = 3.232 10⁻¹¹ J Total energy released = 6.02 10²¹ 3.232 10⁻¹¹ J Total energy released = 19.456 10¹⁰ J Answer: 19.45 10¹⁰ J

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