Assertion: Photoelectric effect supports the quantum nature of light.
Reason : Electric charge of photoelectrons is quantised.

Options

A. Assertion is True, Reason is True,
Reason is a correct explanation for Assertion.
B. Assertion is True, Reason is True,
Reason is not a correct explanation for Assertion.
C. Assertion is True, Reason is False.
D. Assertion is False but, Reason is True.

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
**Assertion:** "Photoelectric effect supports the quantum nature of light."

- The photoelectric effect refers to the phenomenon where electrons are emitted from a material when it is exposed to light (or electromagnetic radiation).
- This effect can only be explained if we consider light as being made up of particles called photons, which have quantized energy levels.
- When a photon with sufficient energy strikes an electron in the material, it can transfer its energy to the electron, allowing it to escape from the surface.
- Therefore, the assertion is **true** because the photoelectric effect indeed supports the idea that light has a quantum nature.

### Step 2: Analyze the Reason
**Reason:** "Electric charge of photoelectrons is quantized."

- The electric charge of the emitted photoelectrons is indeed quantized. This means that the charge can only take on discrete values, specifically integer multiples of the elementary charge (e).
- When a photon strikes an electron and ejects it, only whole electrons are emitted, and thus the charge of the emitted electrons is quantized.
- Therefore, this reason is also **true**.

### Step 3: Determine the Relationship
Now we need to determine if the reason is a correct explanation of the assertion.

- The assertion states that the photoelectric effect supports the quantum nature of light, while the reason discusses the quantization of the electric charge of photoelectrons.
- Although both statements are true, the reason does not explain why the photoelectric effect supports the quantum nature of light. The assertion is about the behavior of light and its particle nature, while the reason is about the properties of the emitted electrons.

### Conclusion
Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.

**Final Answer:**
- Assertion is true.
- Reason is true.
- Reason is not the correct explanation of the assertion.

The correct option is that both statements are true, but the reason is not the correct explanation of the assertion.

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