Example:
15 EHz = 5.003461e+28 wavelength in exametres
1 EHz = 3.335641e+27 wavelength in exametres | 1 wavelength in exametres = 2.997925e-28 EHz
Conversion Steps:
15 × (1e+18 / 2.997925e-10) = 5.003461e+28