X-rays of wavelength of 0.0650 nm undergo Compton scattering from free electrons in a target. What is the wavelength of photons scattered at 90° relative to the incident rays? (h = 6.63 × 10-34 J s, me = 9.11 × 10-31 kg, c = 3 × 108 m/s)

• A. 0.0687 nm
• B. 0.0024 nm
• C. 0.0674 nm
• D. 0.0626 nm