CBSE 2025, Set 3

Question

**Assertion (A):** EM waves do not require a medium for their propagation.

**Reason (R):** EM waves are transverse waves. A). Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B). Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C). Assertion (A) is true, but Reason (R) is false. D). Both Assertion (A) and Reason (R) are false.

Edvaya · Accepted Answer

The correct answer is Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).. **Step 1: Check Assertion (A)**
Electromagnetic waves consist of oscillating electric and magnetic fields that mutually regenerate each other. They can travel through a vacuum and do not require a material medium. (Assertion is **True**).

**Step 2: Check Reason (R)**
In EM waves, the electric and magnetic fields oscillate perpendicular to each other and perpendicular to the direction of propagation. This defines them as transverse waves. (Reason is **True**).

**Step 3: Check Explanation**
The transverse nature of EM waves describes *how* they oscillate, but it is not the *reason* why they don't require a medium. They do not require a medium because they are self-sustaining oscillating fields.

Thus, both A and R are true, but R is NOT the correct explanation of A.

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Physics > Modern Physics > Electromagnetic Waves

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