B tac ∝ υ = υ λ υ = υ = υ = υ λ π υ = υ = υη υ ρ υ ρ υ / dc ω ∝ ω εμ ωσμ

B tac ∝ υ = υ λ υ = υ = υ = υ λ π υ = υ = υη υ ρ υ ρ υ / dc ω ∝ ω εμ ωσμ