Dual Nature Of Radiation

The threshold frequency of a metal is \(f_{0}\). When the light of frequency \(2 f_{0}\) is incident on the metal plate, the maximum velocity of photoelectrons is \(v_{1}\). When the frequency of incident radiation is increased to \(5 \mathrm{f}_{0}\), the maximum velocity of photoelectrons emitted is \(v_{2}\). The ratio of \(v_{1}\) to \(v_{2}\) is :