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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 × 10–8 ev
4 × 10–8 ev
4 × 107 ev
MCQ
Solution
3.1 × 10–8 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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