Question

A surface ejects electrons when hit by green light but not when hit by yellow light. Will electrons be ejected if the surface is hit by red light?

• A. Yes
• B. No
• C. Yes, if the red bream is quite intense
• D. Yes, if the red beam continues to fall upon

Answer 1

The correct option is B No

Energy of red light < Energy of yellow light
$\therefore$ Energy of yellow light is less then threshold energy, it implied energy of red light is less then threshold energy.