Example:
15 EHz = 5.003461e+25 wavelength in petametres
1 EHz = 3.335641e+24 wavelength in petametres | 1 wavelength in petametres = 2.997925e-25 EHz
Conversion Steps:
15 × (1e+18 / 2.997925e-7) = 5.003461e+25