Assertion : The electromagnetic waves are transverse in nature.
Reason : Waves of wavelength 10 μm are radiowave and microwave.

Options

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

Answer

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

### Step 1: Analyze the Assertion
The assertion states that "The electromagnetic waves are transverse in nature."

- **Explanation**: Electromagnetic (EM) waves consist of oscillating electric and magnetic fields that are perpendicular to each other and to the direction of wave propagation. This characteristic is what defines them as transverse waves. Therefore, the assertion is **true**.

### Step 2: Analyze the Reason
The reason states that "Waves of wavelength 10 μm are radio waves and microwaves."

- **Explanation**: The electromagnetic spectrum categorizes waves based on their wavelengths. A wavelength of 10 μm (micrometers) falls within the infrared region of the spectrum, not the radio wave or microwave regions. Therefore, this statement is **false**.

### Step 3: Conclusion
Since the assertion is true and the reason is false, we can conclude that the correct answer is that the assertion is true but the reason is false.

### Final Answer
- The assertion is true, and the reason is false.