241 nm, that is UV light range
The minimum power needed compelled to break the oxygen-oxygen bond = 495 kJ/mol
Energy required for 1 molecule the oxygen = 495 × 10³ J / avogadro"s constant = 495 × 10³ J / ( 6.02 × 10²³) = 8.223 × 10⁻¹⁹ J
Energy = hv
where h = Planck consistent = 6.626 × 10 ⁻³⁴ m²kg/s and v = frequency
c speed of irradiate = vλ
c / λ = v
E = hc / λ
λ = hc / E = (6.626 × 10 ⁻³⁴ m²kg/s × 3.0 × 10 ⁸ m/s) / (8.223 × 10⁻¹⁹ J) = 2.41 × 10⁻⁷m = 241 nm
UV irradiate wavelength is between 400 nm - 10 nm
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