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What is the critical value of 'y' such that the expansion of the Universe may start, given that the Universe is composed of hydrogen atoms with a constant number density 'N' and the charge on the proton is 'e p = -(1 + y)e, where 'e' is the electronic charge?

Options

  1. A10 -17
  2. B10 -18
  3. C10 -19
  4. D10 -20

Correct answer

B. 10 -18

Step-by-step solution

Correct Option is : (B) 10 -18

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