Assertion : The basic difference between various types of electromagnetic waves lies in their wavelength or frequencies
Reason : Electromagnetic waves travel through vacuum with the same speed.

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

Explanation

To analyze the given assertion and reason, we can break down the problem into a step-by-step solution.

### Step 1: Understand the Assertion
The assertion states that the basic difference between various types of electromagnetic waves lies in their wavelength or frequencies. This is true because electromagnetic waves, such as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays, are categorized based on their wavelengths and frequencies.

**Hint:** Consider how different types of electromagnetic waves are classified in the electromagnetic spectrum.

### Step 2: Understand the Reason
The reason provided states that electromagnetic waves travel through a vacuum with the same speed. This is also true; all electromagnetic waves propagate at the speed of light in a vacuum, which is approximately \(3 \times 10^8\) meters per second.

**Hint:** Recall the fundamental property of electromagnetic waves in a vacuum and how it relates to their speed.

### Step 3: Connect the Assertion and Reason
Both the assertion and reason are correct. The assertion highlights the distinction between different types of electromagnetic waves, while the reason explains that despite these differences, they all travel at the same speed in a vacuum. The reason supports the assertion by indicating that the differences in wavelength and frequency do not affect the speed of the waves.

**Hint:** Think about how the speed of electromagnetic waves relates to their frequency and wavelength.

### Step 4: Conclusion
Since both the assertion and reason are true, and the reason provides a correct explanation for the assertion, we conclude that the answer is that both the assertion and reason are correct, and the reason is the correct explanation of the assertion.

**Final Answer:** Both assertion and reason are true, and the reason is the correct explanation of the assertion.