A point source of light is taken away from the experimental setup of photoelectric effect. For this situation, mark out the correct statement (s).

Options

A. Saturation photocurrent decreases
B. Saturation photocurrent increases
C. Stopping potential remains the same
D. Stopping potential increases

Explanation

To solve the question regarding the effect of removing a point source of light from the experimental setup of the photoelectric effect, we can analyze the implications on the photocurrent and stopping potential.

### Step-by-Step Solution:

1. **Understanding the Photoelectric Effect**:
The photoelectric effect occurs when light falls on a material and causes the emission of electrons. The intensity of light and the frequency of light are crucial factors in this phenomenon.

2. **Effect of Distance on Intensity**:
When a point source of light is moved away from the experimental setup, the intensity of light reaching the photoelectric material decreases. This is because intensity is inversely proportional to the square of the distance (I ∝ 1/d²).

3. **Relation Between Intensity and Photocurrent**:
The photocurrent is directly proportional to the intensity of light. Therefore, as the intensity decreases due to the increased distance, the photocurrent will also decrease.

4. **Saturation Photocurrent**:
The saturation photocurrent is the maximum current achieved when all emitted electrons are collected. Since the intensity decreases with distance, the saturation photocurrent will also decrease.

5. **Stopping Potential**:
The stopping potential is the potential required to stop the most energetic photoelectrons emitted from the surface. It is determined by the maximum kinetic energy of the emitted electrons, which is given by the equation:
\[ KE = e \cdot V_s \]
where \( V_s \) is the stopping potential and \( e \) is the charge of an electron. Importantly, the stopping potential depends on the frequency of the incident light, not on its intensity.

6. **Conclusion**:
Since the stopping potential is independent of the intensity of light and thus independent of the distance from the source, it remains constant even if the point source of light is taken away from the experimental setup.

### Final Statements:
- The photocurrent decreases as the distance increases due to decreased intensity.
- The stopping potential remains the same regardless of the distance from the light source.

### Correct Statement:
- The stopping potential remains the same.