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The wavelength of the radiation emitted , when in a hydrogen atom electron falls from infinity to stationary state 1 , would be



E= -13.6(1/n^2 - 1/m^2)
hc/W= -13.6(1/n^2 - 1/m^2). {W means wavelength}
hc/ -13.6(1/n^2 - 1/m^2) =W
solve it by substituting h=6.6×10^-34 ,c=3×10^8
n=1 ,m=infinity
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