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सिद्ध कीजिए की n इलेक्ट्रॉन-वोल्ट ऊर्जा वाले प्रकाश-फोटॉन की तरंगदैर्घ्य `(12375)/(n)Å` होती है ।
(`h=6.6xx10^(-34)`जूल-सेकण्ड, `c=3.0xx10^(8)` मीटर/सेकण्ड )।

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`lambda` तरंगदैर्घ्य कि फोटॉन की ऊर्जा `(hc)/(lambda)` होती है । प्रश्नानुसार ,
`(hc)/(lambda)= n` इलेक्ट्रॉन -वोल्ट (eV)
`:. lambda(hc)/(n eV)`
`=((6.6xx10^(-34)" जूल-सेकण्ड")xx(3.0xx10^(8)" मीटर /सेकण्ड"))/(n eV)`
परन्तु `1 eV = 1.6xx10^(-19)` जूल |
`:. lambda((6.6xx10^(-34)"जूल-सेकण्ड")xx(3.0xx10^(8)" मीटर/सेकण्ड"))/(n eV(1.6xx10^(-19)" जूल/"eV))`
`=(12375xx10^(-10))/(n)" मीटर" = (12375)/(n)Å`.

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