What is the energy in joules of one photon of X-ray radiation with a wavelength of 0.120nm?

The energy of a photon can be calculated using the equation E = hc/λ, where h is the Planck constant (6.626 x 10^-34 J·s), c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength in meters. Converting the given wavelength of 0.120 nm to meters (1 nm = 10^-9 m), we get 1.20 x 10^-10 m. Plugging these values into the equation, we find that the energy of one photon of X-ray radiation with a wavelength of 0.120 nm is approximately 1.65 x 10^-15 J.