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The energy E of a photon and it's wavelength are related by Eλ = X. ...

The energy E of a photon and it's wavelength are related by Eλ = X. the numerical value of X is?
[h = 6.63 x 10-34js, c = 3 x 108 ms-1]
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  • A 6.6 X 10-28
  • B 1.99 X 10-27
  • C 6.60 x 10-26
  • D 1.99 x 10-25
Correct Answer: Option D
Explanation:
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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