The energy released when 1 kg of 235U92 undergoes complete fission, producing 200 MeV per fission, is (molar mass of 235U92= 235 g/mol):
Correct answer: A. 8.51 x 10^13 J
- A. 8.51 x 10^13 J
- B. 9.51 x 10^13 J
- C. 1.05 x 10^14 J
- D. 1.15 x 10^14 J
Explanation
Number of nuclei in 1 kg = (1000/235) × 6.022 × 1023 ≈ 2.56 × 1024 . Energy per fission = 200 MeV = 200 × 1.6 × 1013 J = 3.2 × 1011 J. Total energy = 2.56 × 1024 × 3.2 × 1011 ≈ 8.19 × 1013 J, closest to 8.51 × 1013 J.
Last updated
About Nuclear Physics
Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
Practise Nuclear Physics
1,254 free Nuclear Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.