A) bombarding of electrons on solids
B) bombarding of \[\alpha \text{-}\]particles on solids
C) bombarding of \[\gamma \]-rays on solids
D) bombarding of neutrons on solids
Correct Answer: A
Solution :
X-rays were, first of all obtained by Roentgen. \[He\] obtained X-rays by bombarding electrons on a metal target. These are highly energetic waves.
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