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Question:

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

Infra - red rays

Ultraviolet rays

x rays

γrays

Solution:

E=hc/λ or λ=hc/E=(6.6×10⁻³⁴)×(3×10⁸)/15×10³×1.6×10⁻¹⁹=0.8×10⁻¹²m=0.8Å So it is nearly related to the X-ray wavelength.