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## Homework Statement

I was looking at a solution inmy notes which begins:

ΔE = hc/λ -1st eqn

ΔEΔt ~ (h-bar)/E -2nd eqn

Δt ~ (h-bar)/ (hc/λ)

Δt ~ λ/2∏c

(where 'c' is the speed of light)

What formula has been used to go from:

Δt ~ (h-bar)/ (hc/λ)

to

Δt ~ λ/2∏c