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 1 it is possible to eject electrons 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

Hint:

The photoelectric effect depends on the frequency of light, not just the intensity.

Answer 1

The Correct Option is A

The photoelectric effect occurs when light of sufficient frequency strikes a metallic surface, causing the emission of electrons. Yellow light has a higher frequency than green light, which is why it can cause the ejection of electrons even at the same intensity.