Nuclear Fission and Nuclear Fusion: Source of Energy
ICSE · Class 12 · Physics
All formulas from Nuclear Fission and Nuclear Fusion: Source of Energy in ICSE Class 12 Physics. Key equations, constants, and identities for board exam preparation.
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1) Nuclear Fission
nuclear fission is a process in which a heavy nucleus, after capturing a thermal neutron (having energy 0.027 eV ), splits up into two lighter nuclei
K = (Number of neutrons present at the beginning of present generation) / (Number of neutrons in the beginning of previous generation)
N ∝ r^3 = k1 r^3; A ∝ r^3 = k2 r^3; L ∝ r^2 = k3 r^2
(N-A)/L = (k1-k2)r^3 / k3 r^2 = kr > 1, so r > 1/k
(0.9 MeV) × 236 = 212 MeV, or roughly 200 MeV
2) Chain Reaction, K Factor, Criticality
K = (Number of neutrons present at the beginning of present generation) / (Number of neutrons in the beginning of previous generation)
K = 1
K > 1
K < 1
r > 1/k
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