A hydrogen atom changes its state from n = 3 to n = 2. Due to recoil, the percentage change in the wave length of emitted light is approximately 1×10−n. The value of n is ___________. [Given Rhc = 13.6 eV, hc = 1242 eV nm, h=6.6×10−34Js mass of the hydrogen atom = 1.6×10−27kg]
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