এখানে, W0=3.45 eV=3.45×1.6×10-19J
আমরা জানি, W0=hf0
⇒W0=hcλ0⇒λ0=hcW0
=6.63×10-34×3×1083.45×1.6×10-19m=3.6×10-7m Ans
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