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It is approx. 1.89eV
the energy of the photon of visible of maximum wavelength is indirectly the energy of the photon of red part of spectrum of light.. the maximum wave length of this is 750 nm.. now find the energy of it.. answer is 3.2065 * 10^-19 joules..
visible light fall in balmers series, so in Rydberg eqn, n1=2, asking maximum wavlength, so smallest transition, hence N2=3, there by get wavlength, and use it in e=hc/L, where l is the wavlength
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