Example:
15 PHz = 5.003461e+22 wavelength in petametres
1 PHz = 3.335641e+21 wavelength in petametres | 1 wavelength in petametres = 2.997925e-22 PHz
Conversion Steps:
15 × (1e+15 / 2.997925e-7) = 5.003461e+22