If an electron has a measured wavelength of 1.20 × 10−¹⁰ m,what is its kinetic energy? (h = 6.63 × 10−³⁴ J⋅s,1 eV = 1.6 × 10−¹⁹ J,and m_e = 9.11 × 10−³¹ kg) A) 209 eV B) 55.0 eV C) 105 eV D) 147 eV

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Quizplus · Accepted Answer

The de Broglie wavelength formula λ = h/p can be used to find the momentum p, and then the kinetic energy KE = p²/(2m) can be calculated. Converting the result to eV gives approximately 105 eV.

If an Electron Has a Measured Wavelength of 1