A photo sensitive material would emit electrons if excited by photons beyond the threshold. So cross the threshold you would increase

Options :
  1. intensity of light
  2. wavelength of light
  3. frequency of light
  4. the voltage applied to light source
Answer and Explanation :-

Answer: Option 3

Explanation:

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In closing, I hope everything helps show that I wouldn't be a fade-out or a person who turns to think to drink or dope when things get tough. I believe that anything is possible if you have the combination of love for what you're doing and the will to sit down and not get up until it's done..
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