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Question
A metal surface is illuminated by photons of energy 5 eV and 2.5 eV respectively. The ratio of their wavelengths is ____________.
Options
1 : 3
1 : 4
2 : 1
1 : 2
MCQ
Fill in the Blanks
Solution
A metal surface is illuminated by photons of energy 5 eV and 2.5 eV respectively. The ratio of their wavelengths is 1 : 2.
Explanation:
`"E" = "hc"/lambda`
`"i.e." "E" prop 1/lambda`
`therefore lambda_1/lambda_2 = "E"_2/"E"_1`
` = 2.5/5 = 1/2`
`therefore lambda_1 : lambda_2`
` = 1 : 2`
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The Photoelectric Effect
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