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Question: 

At approximately what time had the universe cooled below the threshold temperature for producing

  1. kaons (M $\approx$ 500 $\textrm{MeV/c}^2$),
  2. $\Upsilon$ (M $\approx$ 9500 $\textrm{MeV/c}^2$), and
  3. muons (M $\approx$ 100 $\textrm{MeV/c}^2$)?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. $10^{-6} \textrm{ s}$
  2. $10^{-8} \textrm{ s}$
  3. $10^{-5} \textrm{ s}$

Giancoli 7th Edition, Chapter 33, Problem 37

(2:90)

Chapter 33, Problem 37 is solved.

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