GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hydrogen:Lithium
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Helium:Hydrogen
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Hydrogen:Helium
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Lithium:Hydrogen
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Detailed explanation-1: -The observed 3:1 ratio of hydrogen to helium along with the relative scarcity of heavier elements yield critical clues about the density, temperature, and expansion rate of the early universe.
Detailed explanation-2: -During the formation of the universe some 14 billion years ago in the so-called ‘Big Bang’, only the lightest elements were formed – hydrogen and helium along with trace amounts of lithium and beryllium.
Detailed explanation-3: -To begin with, it was estimated that only a small amount of matter found in the Universe should consist of helium if stellar nuclear reactions were its only source of production. In fact, it is observed that upwards of 25% the Universe’s total matter consists of helium—much greater than predicted by theory!