Question

The photoelectric minimum (threshold) frequency for a material is 3.3 x 10^-7 m. What is the work function for this material?

A. 9.2 eV

B. 5.6 eV

C. 3.8 eV

D. 6.1 eV

E. 4.9 eV

Answer 1

$hc/\lambda=W\to W=6.62\cdot10^{-34}\cdot3\cdot10^8/3.3\cdot10^{-7}=6.018\cdot10^{-19}\ (J)\approx3.8\ (eV)$

C. 3.8 eV . Answer