Electron emission from a metallic surface by application of light is known as
[amp_mcq option1=”Thermionic emission” option2=”Photoelectric emission” option3=”High field emission” option4=”Autoelectronic emission” correct=”option2″]
This question was previously asked in
UPSC NDA-2 – 2017
Electron emission from a metallic surface caused by the application of light is known as the photoelectric effect, and the emission itself is called photoelectric emission. When light of sufficient frequency strikes a metal surface, it can impart enough energy to electrons to overcome the work function (binding energy) and be ejected from the surface.
– Photoelectric emission is electron emission triggered by light.
– This phenomenon is the basis of the photoelectric effect.