The energy of the em waves is of the order of 15keV. To which part of the spectrum does it belong?

As λ=hcEWhere the symbols have theri usual meanings. Here, E=15keV=15×103 V and hc=1240eVnm∴ λ=1240eVnm15×103eV=0.083nmAs the wavelength range of X -rays is from 1 nm to 10-3 so this wavelength belongs to X -rays.