Question

The current in a photoelectric tube

• A. Decreases with increase in frequency of the incident photon
• B. Increases with increase in frequency of the incident photon
• C. Decreases with increases in intensity of illumination
• D. Increases with increase in intensity of illumination

Answer 1

Answer: (D)

Increases with increase in intensity of illumination

$\begin{array}{c}\text{As, the intensity of light}\\ \text{increases, current increases,}\\ \text{this is because a larger number}\\ \text{of photons now fall on the}\\ \text{metal surface and hence a}\end{array}$

$\begin{array}{c}\text{larger number of electrons}\\ \text{interact with photons. The}\\ \text{number of electrons emitted}\\ \text{increases and hence the current}\\ \text{increases.}\end{array}$

$\begin{array}{c}\text{Hence the current in photoelectric}\\ \text{tube increases with increase}\\ \text{in intensity of illumination.}\end{array}$