Question: At approximately what time had the universe cooled below the threshold temperature for producing (a) Kaons (M 500 MeV/c2). (b) Y (M 9500MeV/c2), and (c)

At approximately what time had the universe cooled below the threshold temperature for producing
(a) Kaons (M ≈ 500 MeV/c2).
(b) Y (M ≈ 9500MeV/c2), and
(c) Muons (M ≈ 100MeV/c2)?

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