| 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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