work function of na is 2.5ev predict whether the wavelength of 6500A is suitable for ejection of electrons
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Energy of incident light , E = hc λ or , E = 6 . 62 × 10 - 34 × 3 × 10 8 65000 × 10 - 10 = 30 . 55 × 10 - 19 J = 19 . ... 5 eV Therefore , this wavelength is suitable for ejection of photoelectron .
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