Question: Q. 1. The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1MeV energy is nearly (a) 1.2 nm (b) 1.2×103 nm (c) 1.2×106 nm (d) 1.2×10 nm

[NCERT Exemplar]

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Solution:

Ans. Correct option : (b)

Explanation: Energy of the photon must be equal to the binding energy of proton

So, energy of photon =1MeV=106×1.6×1019 J

λ=hcE=6.63×1034×3×1081.6×1013=6.63×31.60×1026+13 =19.891.60×1013=12.4×1013=1.24×101×1013 =1.24×109×103=1.24×103 nm



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