1.

A metal surface ejects electrons when green light is incident on it but no emission take place when yellow light is incident on it. The electrons will be emitted when the surface has(1) Red light (2) Blue light (3) Heat rays (4) Infrared light

Answer»

Correct option : (2) Blue light

Explanation:

Green light ejects electrons but yellow does not. The only option out of given four only blue light can cause emission (VIGB YOUR). 



Discussion

No Comment Found