Question

A metal surface ejects electrons when hit by green light but none when hit by yellow light. The electrons will be ejected when the surface is hit by

• A. blue light
• B. heat rays
• C. infrared light
• D. red light

Answer 1

The correct option is A blue light

The photoelectric emission is possible if the wavelength of the incident light is less than that of yellow light.
${\lambda }_Y>{\lambda }_G>{\lambda }_B$
Option A