CBSE 2025, Set 2

Question

**Assertion (A):** X-rays are produced when slow moving electrons are stopped by a metal target of high atomic number.
**Reason (R):** X-rays consist of low-energy photons. 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 false.. **Step 1: Check Assertion (A)**
X-rays are produced when highly energetic, **fast-moving** electrons (accelerated through a high voltage) are suddenly decelerated or stopped by a heavy metal target. Slow-moving electrons do not possess enough kinetic energy to produce X-rays. (Assertion is **False**).

**Step 2: Check Reason (R)**
X-rays sit on the higher frequency end of the electromagnetic spectrum, meaning they consist of **high-energy** photons ($E = h
u$), not low-energy ones. (Reason is **False**).

Thus, both A and R are false.

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Physics > Modern Physics > Electromagnetic Waves

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