The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1 MeV energy is nearly (a) 1.2 nm (b) 1.2 × 10–3 nm (c) 1.2 × 10–6 nm (d) 1.2 × 101 nm
Correct option is B) Here, E=1MeV=106eV,h=6.63×10−34Js,c=3×108ms−1 ∴hc=1.6×10196.63×10−34×3×108=1240eVnm As E=λhcorλ=Ehc=106eV1240eVnm=1.24×10−3nm
