Assertion Photoelectric effect can take place only with an electron bound in the atom
Reason Electron is a fermion Whereas proton is a boson

Options

A. Both assertin and reason are true and reason is the correct explanation of assertion
B. Both assertion and reason are true but reason is not the correct explanation of assertion
C. Assertion is true but reason is flase
D. Both assertion and reason are false

Explanation

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

### Step 1: Understand the Assertion
The assertion states that "Photoelectric effect can take place only with an electron bound in the atom."

- The photoelectric effect refers to the phenomenon where electrons are emitted from a material (usually a metal) when it is exposed to light (photons) of sufficient energy.
- However, it is important to note that the photoelectric effect primarily involves the emission of free electrons from the surface of a metal, rather than electrons that are bound within an atom.
- Therefore, the assertion is **false** because the photoelectric effect can occur with free electrons, not just those bound in atoms.

### Step 2: Understand the Reason
The reason states that "Electron is a fermion whereas proton is a boson."

- In particle physics, fermions are particles that follow the Pauli exclusion principle and have half-integer spin (e.g., electrons, protons, and neutrons).
- Bosons, on the other hand, are particles that have integer spin and can occupy the same quantum state (e.g., photons, W and Z bosons).
- Protons are made up of three quarks and are classified as fermions, not bosons. Thus, the statement that "proton is a boson" is incorrect.

### Step 3: Conclusion
Based on the analysis:
- The assertion is **false**.
- The reason is also **false**.

Thus, the correct answer is that both the assertion and the reason are false.

### Final Answer
Both the assertion and the reason are false.

---