When a certain metallic surface is illuminated with monochromatic light of wavelength `lambda`, the
Channel: Doubtnut
Date: 2020-01-28

When a certain metallic surface is illuminated with monochromatic light of wavelength `lambda`, the stopping potential for photo electric current is `6 v_(0)`. When the same surface si illuminated with light of wavelength `2 lambda`, the stopping potential is `2v_(0)`. The threshold wavelength of this surface for photoelectric effect is -