Example:
15 wavelength in petametres = 4.496887e-18 THz
1 wavelength in petametres = 2.997925e-19 THz | 1 THz = 3.335641e+18 wavelength in petametres
Conversion Steps:
15 × (2.997925e-7 / 1e+12) = 4.496887e-18