Write down the units of the following quantities and give their physical meanings : 1) microscopic cross section ( ), 2) f

Write down the units of the following quantities and give their physical meanings : 

1) microscopic cross section ( σ ), 2) ∑_f∅ , 3) v∑_f∅ , 4) ∑_f∅V , and 5) κ∑_f∅V = 200 MeV/fission .