Assertion :-(A) semiconductors are solids with conductivites in the intermediate range from`10^(-6)-10^(4) ohm ^(-1)m^(-1)`
Reason :-(R ) internmediate conductivity in semiconductor Is due to partially filled valence band .

Options

A. Assertion and reason both are correct statements and Reason is correct explantion for Assertion .
B. Asserton and Reason both are correct statement but Reason is not correct explanation for assertion .
C. Assertion is correct statement but reason is worng statement .
D. Assertion is Wrong statement but Reason is correct statement .

Explanation

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

### Step 1: Analyze the Assertion
The assertion states that "semiconductors are solids with conductivities in the intermediate range from \(10^{-6}\) to \(10^{4} \, \Omega^{-1} m^{-1}\)."

**Solution:**
This statement is true. Semiconductors indeed have conductivities that fall within this range. This is a well-established fact in solid-state physics.

### Step 2: Analyze the Reason
The reason states that "intermediate conductivity in semiconductors is due to a partially filled valence band."

**Solution:**
This statement is incorrect. The intermediate conductivity of semiconductors is not primarily due to a partially filled valence band. Instead, it is due to the energy gap between the valence band and the conduction band. In semiconductors, this energy gap allows for some electrons to jump from the valence band to the conduction band when energy is supplied, which contributes to conductivity.

### Step 3: Conclusion
Now that we have analyzed both statements:
- The assertion is true.
- The reason is false.

Thus, the correct conclusion is that the assertion is correct, but the reason is not a correct explanation for the assertion.

### Final Answer
Assertion is correct, but the reason is incorrect.

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