if the frequency of an electromagnetic raditaion is 7.5x10^10Hz what is the wavelength?

if the frequency of an electromagnetic raditaion is 7.5x10^10Hz what is the wavelength ?

$$Hz = \frac{1}{s}$$

$$\text{speed of light: } c = 299 792 458 \ \frac{ m }{ s } = 0,0299792458 * 10^{10}\ \frac{ m }{ s }$$

$$\text{frequency : } f = 7,5 * 10^{10}\ \frac{ 1 }{ s }$$

$$\text{wavelength: } \lambda = \dfrac{ c }{ f } = \frac { 0,0299792458 * 10^{10}\ \frac{ m }{ s } } {7,5 * 10^{10}\ \frac{ 1 }{ s } } = \frac { 0,0299792458 } { 7,5 } \ m =0.00399723277\ m$$

the wavelength is 0.00399723277 m   or    $$3.99723277 * 10^{-3} \ m$$