A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3 × 10^14 Hz. The velocity of…

A metal surface is exposed to $\displaystyle 500$ nm radiation. The threshold frequency of the metal for photoelectric current is $\displaystyle 4.3 \times 10^{14} \mathrm{~Hz}$. The velocity of ejected electron is \_\_\_\_ $\displaystyle \times 10^5 \mathrm{~ms}^{-1}$. (Nearest integer) [Use : $\displaystyle \mathrm{h}=6.63 \times 10^{-34} \mathrm{Js}, \mathrm{m}_{\mathrm{e}}=9.0 \times 10^{-31} \mathrm{~kg}$ ]