Assertion: we can increases the saturation current in photoelectric experiment without increasing the intensity of light.
Reason: Instensity can be increased by increasing the frequency of incident photons.

Options

A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
B. If both Assertion and Reason or true but Reason is not the correct explanation of Assertion.
C. If Assertion is true, but the Reason is false.
D. If Assertion is false but the Reason is true.

Explanation

To solve the question regarding the assertion and reason related to the photoelectric experiment, we will analyze both statements step by step.

### Step 1: Understand the Assertion
The assertion states: "We can increase the saturation current in a photoelectric experiment without increasing the intensity of light."

**Explanation:**
- The saturation current in a photoelectric experiment is directly proportional to the number of photoelectrons emitted, which in turn is proportional to the number of incident photons.
- The intensity of light is defined as the energy per unit area per unit time, which can be expressed as:
\[ I = \frac{E}{A \cdot t} = n \cdot h \cdot \nu \]
where \(I\) is intensity, \(n\) is the number of photons, \(h\) is Planck's constant, and \(\nu\) is the frequency of the incident light.

### Step 2: Analyze the Relationship Between Saturation Current and Intensity
- The saturation current \(I_s\) is proportional to the number of emitted photoelectrons, which is proportional to the number of incident photons \(n\).
- If we keep the intensity constant and change the frequency, we can see that:
\[ I = n \cdot h \cdot \nu \]
If we decrease the frequency \(\nu\) while keeping intensity constant, the number of photons \(n\) must increase to maintain the equality.

### Step 3: Conclusion on the Assertion
- Thus, it is indeed possible to increase the saturation current by increasing the number of photons (by decreasing frequency) while keeping the intensity constant.
- Therefore, the assertion is **true**.

### Step 4: Understand the Reason
The reason states: "Intensity can be increased by increasing the frequency of incident photons."

**Explanation:**
- The intensity of light is given by the same equation:
\[ I = n \cdot h \cdot \nu \]
- If we increase the frequency \(\nu\) while keeping the number of photons \(n\) constant, the intensity \(I\) will increase.
- Thus, the reason is also **true**.

### Step 5: Conclusion on the Reason
- However, the reason does not correctly explain the assertion. The assertion is about increasing saturation current without increasing intensity, while the reason suggests that increasing frequency increases intensity.

### Final Conclusion
- Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion. Therefore, the correct answer is option B: "Both assertion and reason are true, but reason is not the correct explanation of the assertion."

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