Question

Find the Planck constant.

Answer 1

when $\lambda =350$ $V_s=1.45$

$\lambda =400$ $V_s=1$

$\frac{h}{350}=w+\mathrm{1.45.........}\left(1\right)$

$\frac{h}{400}=w+\mathrm{1.........}\left(2\right)$

$h=4.2\times {10}^{-15}\frac{eV}{s}$