When a certain metal surface is illumina...

When a certain metal surface is illuminated with light of frequency v, the stopping potential for photoelectric current is `V_(0)`. When the same surface is illuminated by light of frequency `(v)/(2)` the stopping potent `(V_(0))/(4)`. The threshold frequency for photoelectric emission is

`(v)/(6)`

`(v)/(3)`

`(2v)/(3)`

`(4v)/(3)`

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