PHOTOELECTRIC EMISSION

A : The process of photoelecton emission and thermionic emission of electrons is different . R : Photoelectric emission does not depend upon tempereature , whereas thermionic emission is temperature depandent .

If the wavelength of light in an experiment on photoelectric effect is doubled, (i) the photoelectric emission will not take place (ii) the photoelectric emission may or may not take place (iii) the stopping potential will increase (iv) the stopping potential will decrease