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Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J. -

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Question

Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J.

Options

  • 2 × 108 ev

  • 3.1 × 108 ev

  • 4 × 108 ev

  • 4 × 107 ev

MCQ

Solution

3.1 × 108 ev

Explanation:

`lambda = 40, h = 6.63 xx 10^-34`

E = hv = `(hc)/lambda`

`(6.63 xx 10^-34 xx 3 xx 10^8)/(40 xx 1.6 xx 10 - 19) = 3.1 xx 10^-8` ev

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