A) p-rays
B) X-rays
C) Cosmic rays
D) Both (a) and (b)
Correct Answer: D
Solution :
The range of wavelength of waves is very large and on this basis they are given an order. This order is called electromagnetic spectrum it ranges from very small gamma rays to very long radio waves, while X-rays lie in between whereas \[\beta \]-rays are stream of high energy electrons coming from the radioactive nucleus, and cosmic rays having high energy charged particles like \[\alpha \]-particles, protons etc., come from outer space, \[\beta \]-rays and cosmic rays are not included in electromagnetic spectrum.
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