Energy in electronvolts is sometimes expressed through the wavelength of light with photons of the same energy: 1 eV h c = 1.602 176 634 × × 10 − − 19 J ( 2.99 792 458 × × 10 10 cm / s ) × × ( 6.62 607 015 × × 10 − − 34 J ⋅ ⋅ s ) ≈ ≈ 8065.5439 cm − − 1 .