Assertion: Silicon is preferred over germanium for making semiconductor devices.
Reason: The energy gap for germanium is more than the energy gap of silicon.

Options

A. If both the assertion and reason are true and reason is a true explantion of the assertion.
B. If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.
C. If the assertion is true but reason false
D. If both the assertion and reason are false.

Explanation

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

### Step 1: Understand the Assertion
The assertion states that "Silicon is preferred over germanium for making semiconductor devices." This is a well-known fact in semiconductor technology. Silicon is indeed the most widely used material for semiconductor devices due to its favorable properties.

**Hint:** Recall the common materials used in semiconductor devices and their applications.

### Step 2: Understand the Reason
The reason given is "The energy gap for germanium is more than the energy gap of silicon." To evaluate this, we need to know the energy band gaps of both materials.

- The energy gap (band gap) of germanium (Ge) is approximately 0.7 eV.
- The energy gap (band gap) of silicon (Si) is approximately 1.1 eV.

**Hint:** Look up the energy band gaps of silicon and germanium to compare their values.

### Step 3: Compare the Energy Gaps
From the values mentioned:
- Germanium (0.7 eV) has a smaller energy gap than silicon (1.1 eV). Therefore, the statement that "the energy gap for germanium is more than the energy gap of silicon" is incorrect.

**Hint:** Remember that a larger energy gap typically means better performance in high-temperature applications and lower leakage currents.

### Step 4: Conclusion
Since the assertion is true (silicon is preferred over germanium for semiconductor devices), but the reason is false (the energy gap of germanium is not more than that of silicon), we conclude that:

- The assertion is true.
- The reason is false.

Thus, the correct answer is that the assertion is true, but the reason is false.

**Final Answer:** Assertion is true; Reason is false.