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टंगस्टन के लिए देहली तरंगदैर्घ्य का मान 2300 Å है | इसकी सतह पर 1800 Å तरंगदैर्घ्य का पराबैगनी प्रकाश डाला जाये तो उत्सर्जित फोटो इलेक्ट्रॉन की अधिकतम गतिज ऊर्जा इलेक्ट्रॉन वोल्ट में ज्ञात कीजिए |
`(h = 6*6 xx 10^(-34)` जूल-सेकण्ड, `c = 3 xx 10^(8)` मीटर/सेकण्ड)

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आइंस्टीन के प्रकाश विघुत समीकरण से,
`E_(k) = hv - hv_(0)`
` = (hc)/(lambda) - (hc)/(lambda_(0)) = hc((1)/(lambda) - (1)/(lambda_(0)))`
` = hc((lambda_(0)-lambda)/(lambdalambda_(0)))`
` = 6*6 xx 10^(-34) xx 3 xx 10^(8)`
`xx[((2300 - 1800) xx 10^(-8))/(2300 xx 10^(-8) xx 1800 xx 10^(-8))]`
` = 2*39 xx 10^(-19)` जूल
` = (2*39 xx10^(-19))/(1*6 xx 10^(-19))eV = 1*49eV.`

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