What is the frequency of X-rays of 10 nm wavelength?

Question

6 x 10^16 Hz

3 x 10^16 Hz

3.00 Hz

6 x 10^8 Hz

Answer 1

f=c/λ=3•10⁸/10⁸ =3Hz

Answer 2

f=c/λ=3•10⁸/10⁻⁸ =3Hz