If an electron has a wavelength of 0.123 nm, what is its kinetic energy, in electron-volts? This energy is not in the relativistic region
(melectron = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 19.8 eV
B) 60.2 eV
C) 80.4 eV
D) 99.5 eV
E) 124 eV
D
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