Example:
15 aHz = 5.003461e-11 wavelength in petametres
1 aHz = 3.335641e-12 wavelength in petametres | 1 wavelength in petametres = 2.997925e+11 aHz
Conversion Steps:
15 × (1e-18 / 2.997925e-7) = 5.003461e-11