When the light of frequency $2{\nu }_0$ (where ${\nu }_0$ 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 $5{\nu }_0$, the maximum velocity of electrons emitted from the same plate is $v_2$. The ratio of $v_1$ to $v_2$ is:

1. A
   $4:1$
2. B
   $1:4$
3. C
   $1:2$
4. D
   $2:1$