A certain green light has a frequency of 2.45 x 1014 Hz. What is the wavelength of the light?

I don't know formulas so I will have to work it out using logic and rates.

hz=cycles /second

wavelength=metres/cycle

speed of light is  299 792 458 m / s      (according to some clever person on Google)

m/cycle=m/s*s/cycle   (the seconds cancel out)

m/cycle= 299 792 458 divided by 2.45 x 10^14  

$${\frac{{\mathtt{299\,792\,458}}}{\left({\mathtt{2.45}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{{\mathtt{14}}}\right)}} = {\mathtt{0.000\: \!001\: \!223\: \!642\: \!685\: \!7}}$$       this is in metres

$${\frac{{\mathtt{299\,792\,458}}}{\left({\mathtt{2.45}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{{\mathtt{14}}}\right)}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{{\mathtt{9}}} = {\mathtt{1\,223.642\: \!685\: \!714\: \!285\: \!714\: \!3}}$$       this is in nanometres

I think that is correct