6.6 X 10-28
1.99 X 10-27
6.60 x 10-26
1.99 x 10-25
Correct answer is D
E = HF = (hc)/λ
Eλ = hc
∴ X = hc ==6.63 x 10-34 x 108
= 1.989 x 10-25
=1.99 x 10-25
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