When the light of frequency 2 0 (where 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 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

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