What is the frequency of radiation whose wavelength is 5 * 10^-6 cm?

problem can be solved using the equation  c = freq x wavelength, where c is the speed of light, which is 3.00 x 10^8 m / s  freq = c / wavelength  freq = (3.00 x 10^8m /s) / (2.40 x 10^-5 cm x 1 m /100cm)  freq = (3.00 x 10^8 m/s) / 2.40 x 10^-7m  freq = 1.25 x 10^15/s 1 / s = 1Hz  freq = 1.25 x 10^15Hz

Idk the answer sorry