Which of the following statement is correct ?

Options

A. The photocurrent increases with intensity light
B. The stopping potential increases with increases in intensity of incident light
C. The current in photocell increases with increasing frequency
D. The photocurrent is proportional to the applied voltage

Answer

To determine which statement is correct regarding the photoelectric effect, we can analyze the information provided in the video transcript step by step.

### Step-by-Step Solution:

1. **Understanding the Photoelectric Effect**:
- The photoelectric effect occurs when light of sufficient frequency strikes a metal surface, causing the emission of electrons. The minimum frequency required to emit electrons is known as the threshold frequency (ν₀).

2. **Work Function**:
- The work function (φ) is the minimum energy required to remove an electron from the surface of the metal. If the energy of the incident photons (E = hν) is greater than φ, electrons will be emitted.

3. **Intensity and Photoelectric Current**:
- The intensity of light is directly proportional to the number of photons striking the surface per unit time. An increase in intensity results in an increase in the number of emitted electrons, thus increasing the photoelectric current.

4. **Stopping Potential**:
- The stopping potential is the voltage needed to stop the emitted electrons from reaching the anode. It is dependent on the frequency of the incident light, not the intensity. As the frequency increases, the stopping potential also increases.

5. **Saturation Current**:
- The saturation current is the maximum current that can be achieved when all emitted electrons are collected. It is directly proportional to the intensity of the incident light.

6. **Analyzing the Statements**:
- **Statement 1**: The photo current increases with the intensity of light. (Correct)
- **Statement 2**: The stopping potential increases with increasing intensity of incident light. (Incorrect, it depends on frequency)
- **Statement 3**: The current in the photo cell increases with increasing frequency. (Incorrect, it depends on intensity)
- **Statement 4**: The photo current is proportional to the applied voltage. (Incorrect, it becomes constant after a certain voltage)

### Conclusion:
The correct statement regarding the photoelectric effect is that the photo current increases with the intensity of light.