A) \[\beta \]-rays
B) Heat rays
C) X-rays
D) \[\gamma \]-rays
Correct Answer: A
Solution :
\[\beta \]-rays are fast moving electrons. So, they are not electromagnetic waves. Heat rays can travel through vacuum via radiation process. They are electromagnetic waves. X-rays are electromagnetic waves having wavelengths from about \[{{10}^{-8}}m\,\,to\,\,{{10}^{-12}}m\]. \[\gamma \]-rays are electromagnetic waves having wavelengths ranging from about \[{{10}^{-6}}m\,\,to\,\,{{10}^{-14}}m\]. Hence, choice (a) is correct.
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