Question

In the phenomenon of photoelectric emission, on increasing the intensity of incident light, the photoelectric current

• A. increases
• B. decreases
• C. remains unchanged
• D. first increases then remains constant

Hint:

In the photoelectric effect, the current increases with the intensity of the incident light, as more photons contribute to ejection of electrons.

Answer 1

The Correct Option is A

Step 1: Photoelectric effect overview.
The photoelectric effect occurs when light strikes a material and ejects electrons from it. The current produced depends on the number of ejected electrons, which is influenced by the intensity of the incident light.
Step 2: Effect of intensity.
When the intensity of the incident light increases, more photons hit the material, leading to the emission of more electrons. This increases the photoelectric current.
Step 3: Elimination.
- (A) increases: Correct, the photoelectric current increases with intensity.
- (B) decreases: Incorrect, as the current increases with intensity.
- (C) remains unchanged: Incorrect, as intensity affects the current.
- (D) first increases then remains constant: Incorrect, current continuously increases with intensity.
Step 4: Conclusion.
Thus, the photoelectric current increases with the intensity of the incident light.