Question

A metallic surface ejects electrons. When exposed to green light of intensity $I$ but no photoelectrons are emitted, when exposed to yellow light of intensity $I$. It is possible to eject electron from the same surface by:

• A. Yellow light of same intensity which is more than $I$
• B. Green light of any intensity
• C. Red light of any intensity
• D. None of the above

Answer 1

Answer: (B)

Green light of any intensity

Ejection of photoelectron does not depends on Intensity but on Frequency.

Frequency of yellow and red light is less than that of green light so they can't eject photoelectrons.