16. X rays of wavelength 0.01 nm (= 0.01 × 10⁻⁹ m) are Compton scattered though an angle of 60°. What is the kinetic energy of the scattered electrons, which are initially at rest? Here 1 eV = 1.6 × 10⁻¹⁹ J, the Plank's constant h = 6.6 × 10⁻³⁴ J·s, the speed of light c = 3.0 × 10⁸ m/s, and the Compton wavelength λ_c = 2.42 × 10⁻¹² m.
(A) 1.3 eV
(B) 1.3 × 10 eV
(C) 1.3 × 10² eV
(D) 1.3 × 10³ eV
(E) 1.3 × 10⁴ eV

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