When monochromatic light of wavelength...

When monochromatic light of wavelength `lambda` is incident on a metallic surface the stopping potential for photoelectric current is `3V_(0)` when same surface is illuminated with light of waelength `2lambda` the stopping potential is `V_(0)`
The threshold wavelength for this surface when photoelectric effect takes place is

`lambda`

`2lambda`

`3lambda`

`4lambda`

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