Nuclear Force, Radioactivity & Fission Challenge
25 NEET-standard questions on the nuclear force, radioactive decay and nuclear fission. Answer each one. If you get it wrong, Vidya Ma’am explains it with an animated movie you can control, a slider to play with, and a step-by-step solution. Then try again.
NCERT Physics XII Part II · Ch. 13 · pp. 313–315Keys: A–D or 1–4 to answer
🧠 Formula memory tricks (open before you start)
Nuclear forceStrongest of the three; short range, a few fm. Same for p–p, n–n, p–n.No simple formula
Potential energy curveU minimum at r₀ ≈ 0.8 fmr > r₀ attractive · r < r₀ repulsive · F = −dU/dr
SaturationA nucleon feels only close neighbours.So Eb/A ≈ 8 MeV stays nearly constant
Decay rulesα: Z−2, A−4 · β⁻: Z+1 · β⁺: Z−1 · γ: noneβ⁻ = electron, β⁺ = positron
Eb/A curveFlat ≈ 8 MeV for A = 30 to 170.Fission: A = 240 (7.6 MeV) → two A = 120 (8.5 MeV)
Fission energy240 × 0.9 ≈ 216 MeV ≈ 200 MeVn + U-235 → U-236 → two fragments + neutrons
ConserveA and Z on both sides; count every neutron.1 kg U ≈ 10¹⁴ J, 1 kg coal ≈ 10⁷ J
right first tryfixed after explanationstill to fix
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