2 2 Photoelectrons are observed to just emit out of a

Last updated: 6/11/2023

2 2 Photoelectrons are observed to just emit out of a material surface when the light of 620 nm falls on it with the intensity of 100 W m If the light of wavelength 400 nm is incident on the same material with an intensity of 1 W m2 what would be the minimum reverse potential needed to stop the outflow of the electrons 1 1 V 3 1 2 V 2 2 V 4 1 9 V