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Per NCERT Example 5.11, in an elastic collision between a neutron and DEUTERIUM (m₂ = 2 m₁), the fraction of neutron KE transferred to deuterium is approximately which?
A1/2 (≈ 50%)
B1/9 (≈ 11%)
C8/9 (≈ 89%)
D1 (full transfer)
Answer & Solution
Correct answer: C. 8/9 (≈ 89%)
NCERT Ex 5.11: f₂ = 4 m₁ m₂ / (m₁ + m₂)² = 4·1·2 / 9 = 8/9 ≈ 89%. Why D₂O is a good moderator.
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