A : Static crashes are heard on a radio when a lightening flash occurs.
R : Light and radiowaves are EM waves and they interfere.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the assertion-reason question, we need to analyze both the assertion (A) and the reason (R) provided.

### Step 1: Analyze the Assertion (A)
The assertion states: "Static crashes are heard on a radio when a lightning flash occurs."

- When lightning occurs, it generates a strong electromagnetic disturbance. This disturbance can produce radio waves that interfere with the normal reception of radio signals, leading to static crashes or noise on the radio.

### Step 2: Analyze the Reason (R)
The reason states: "Light and radio waves are EM waves and they interfere."

- Both light waves and radio waves are indeed types of electromagnetic (EM) waves. They can interfere with each other because they share the same fundamental nature as waves, leading to phenomena such as constructive and destructive interference.

### Step 3: Determine the Relationship
Now, we need to determine if the reason correctly explains the assertion.

- The assertion is true because static crashes do occur on radios during lightning flashes due to the electromagnetic interference caused by the lightning.
- The reason is also true because light and radio waves are both EM waves, and they can interfere with each other.

### Conclusion
Since both the assertion and reason are true, and the reason provides a correct explanation for the assertion, we can conclude that:

**Both Assertion (A) and Reason (R) are true, and R is the correct explanation of A.**

### Final Answer
The correct answer is that both the assertion and reason are true, and the reason is the correct explanation for the assertion.

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