A) \[\alpha -\]particle
B) \[\beta -\]particle
C) \[\gamma -\]rays
D) X-rays
Correct Answer: A
Solution :
Out of the given choices, X-rays and \[\gamma -\]rays are electromagnetic waves, so have no change. \[\beta -\]particles are negatively charged particles and are fast moving electrons. Alpha \[(\alpha )\] particles have positive charge and is a nucleus of helium.
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