When the light of frequency $2v_o$ (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 eletrons emitted from the same plate is $v_2$. The ratio of $v_1$ to $v_2$ is

Question

( A ) 1 : 4
( B ) 2 : 1
( C ) 1 : 2
( D ) 4 : 1