Ta có: \(\lambda_0=0,35.10^{-6}(m), 1eV=1,6.10^{-19}(J)\)
Công thoát của êlectron khỏi kẽm là:
\(A=\dfrac{hc}{\lambda_0}=\dfrac{6,625.10^{-34}.3.10^8}{0,35.10^{-6}}\approx 5,68.10^{-19}(J)=\dfrac{5,68.10^{-19}}{1,6.10^{-19}}\approx 3,55(eV).\)
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