|Which of the following statement(s) is / are correct with respect to cosmic rays?|
|1. They are made up of only positively charged particles.|
|2. The major source of cosmic rays in universe is Sun.|
|3. They cause ozone depletion.|
|Select the correct answer using the codes given below.|
A) 1 and 2
B) 2 and 3
C) Only 3
D) All of these
Correct Answer: C
Solution :[c] Almost 90% of cosmic rays are protons, about 9% are helium nuclei (alpha particles) and nearly 1% are 5-ectrons. This means that cosmic rays are not made up of only positively charged particles. Cosmic rays may broadly be divided into two categories: primary and secondary. The cosmic rays that originate from astrophysical sources are primary cosmic rays; these primary cosmic ray interact with interstellar matter creating secondary cosmic rays. Sun is not the major source but exactly is a minor source.
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