What is a light-year? It’s a unit of?
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————————————- Choose the correct Answer ——————————————– A. work done in rolling is more than in lifting B. work done in lifting the stone is equal to rolling it C. work done in both is same but the rate of doing work is less in rolling D. work done in rolling a stone is less than ...Read more
A) Collision between fast neutrons and nitrogen nuclei present in the atmosphere B) Action of ultraviolet light from the sun on atmospheric oxygen C) Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere D) Lightning discharge in atmosphere
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