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W₂= 2,5 eV= 4*10⁻¹⁹J
W₁= hc/(lambda₁)
(lambda₁)= hc/W₁= (6,63*10⁻³⁴Js × 3*10⁸m/s)÷7,232*10⁻¹⁹J= 2,75*10⁻⁷m
(lambda₂) hc/W₂= 4,97*10⁻⁷m