Two stream of photons, possessing energies equal to twice and ten times the work function of metal are incident on the

(1)

Forphotoelectric effectk. $\mathrm{E}_{\max }=\mathrm{E}-\phi$

$\mathrm{E}_{1}=2 \phi_{r} \quad \mathrm{k}_{1}=\phi$

$\mathrm{E}_{2}=10 \phi_{r} \quad \mathrm{k}_{2}=9 \phi$

$\therefore V \propto \sqrt{k} \quad\left(k=\frac{1}{2} m v^{2}\right)$

$\frac{v_{1}}{v_{2}}=\sqrt{\frac{1}{9}} \Rightarrow \frac{1}{3}=\frac{x}{y}$

$\mathrm{x}=1$