Question

A metallic surface ejects electrons when hit by green light but none when hit by yellow light. Will the electrons be ejected if the same surface is hit by red light?

• A. Yes
• B. No
• C. Yes, if the red beam is sufficiently intense
• D. Yes, if the red beam is allowed to fall for sufficient duration

Answer 1

The correct option is B No

$\text{Energy of photon}\propto \frac{1}{\lambda }$

Since the wavelenght of red light is greater than green light ,so electron will be ejected if red red light falls on same surface.