Question

What is the frequency of an x-ray with wavelength 0.15 nm ? assume that the wave travels in free space?

Answer 1

Let's convert first the wavelength into meters:

`\lambda = 0.15 nm = 0.15 \cdot 10^(-9)m`
Then, we know that the wavelength is related to the frequency by the following equation:

`f = (c)/(\lambda)`
Where
`c=3 \cdot 10^8 m/s` is the speed of light in free space. Therefore, putting in the numbers, we find the frequency f:

`f= (3 \cdot 10^8 m/s)/(0.15 \cdot 10^(-9)m)=2 \cdot 10^(18)Hz`