Discussion
Primary cosmic rays are composed of very energetic :
Answer: C
Primary cosmic rays are mostly very energetic protons.
About 90 per cent of the primary cosmic ray particles arriving at the top of the atmosphere are protons (hydrogen nuclei), about 9 per cent are alpha particles (helium nuclei), and the remaining 1 per cent are heavier nuclei and electrons.
Mesons such as pions and muons are secondary cosmic rays, created when the primary particles collide with nuclei of air in the upper atmosphere. Free neutrons are also secondary products and would decay in transit from distant sources. Electrons make up only a small fraction of the primary flux.
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