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X-rays are emitted from atoms that are:

AInert
BHeavy
CLight
DIonic
Answer & Solution
Correct answer: B. Heavy
1. X-ray emission involves inner shell electrons. 2. Those shells are tightly bound only in large atoms. 3. So X-rays are emitted from heavy atoms. 4. The answer is heavy. _Source: syllabus Physics, Ch 8 'Electromagnetic Waves'_
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