When the light of frequency \(2v_0\) (where \(v_0\) is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is \(v_1\) . When the frequency of the incident radiation is increased to \(5v_0\) , the maximum velocity of electrons emitted from the same plate is \(v_2\) . The ratio of \(v_1\) to \(v_2\) is