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Find the maximum wavelength of light that can cause photoelectric effect in lithium. (work function of lithium is 2.5 eV )

Find the maximum wavelength of light that can cause photoelectric effect in lithium. (work function of lithium is 2.5 eV ) 

Grade:12

1 Answers

Arun
25750 Points
6 years ago
\Phi = h \nu = h c/\lambda
\lambda = h c /\phi
= (4.14 * 10 ^-15 ev) *(3 * 10^8 m/sec)/ 2.5 ev
On calculation
\lambda= 497 nano metres
hope you got the answer.
 

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