Formula of energy is-
E = hc/λ
Hence, λ= hc/E
wavelength λ = hc/E = 6.626 x 10-27 erg s x 3.0 x 1010 cm s-1 / 3 x 10-12 erg = 6.626 x 10-5 cm
Since, 1 cm = 107 nm
Therefore the wavelength in nm = 6.626 x 10-5 x 107 nm = 6.626 x 102 nm = 662.
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