Question #deec2

1 Answer
Aslam S.
Jul 10, 2015

417 nm

Explanation:

planks equation gives us the relation E=hc/lambdaE=hcλ
or lambda=hc/Eλ=hcE
as E is in electron volts we need to first convert it into joules
E=3eV=3(1.6xx10^-19)=4.8xx10^-19E=3eV=3(1.6×10−19)=4.8×10−19J
Thus
lambda=6.67xx10^-34xx(3xx10^8)/(4.8xx10^-19)λ=6.67×10−34×3×1084.8×10−19
lambda=λ= 416.875 nm

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