Ram Sharma • 193.88K Points
Coach Physics

Q. Which among the given is not true about X-rays -

X-rays have high penetrating power, which allows them to pass through soft tissues and be used in medical imaging (like X-rays of bones).

Why are the other options true?

(A) Can affect photographic plates → ✅ True

X-rays darken photographic plates, which is why they are used in medical imaging.

(B) Can be reflected or refracted → ✅ True

Though X-rays are mostly absorbed or transmitted, they can undergo reflection and refraction under specific conditions (like in X-ray crystallography).

(D) Travel with the speed of light → ✅ True

X-rays are a type of electromagnetic radiation, so they travel at the speed of light (≈ 3 × 10⁸ m/s in a vacuum).

Thus, the incorrect statement is (C) X-rays have low penetrating power because X-rays actually have high penetrating power.

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