A proton has a speed of 7.2 × 10⁴ m/s.The energy of a photon that has the same de Broglie wavelength as the proton is closest to: A)230 keV B)150 keV C)300 keV D)370 keV E)440 keV

Question

Quizplus · Accepted Answer

The de Broglie wavelength λ is given by λ = h/p, where h is Planck's constant and p is momentum. For a proton, p = mv. Calculate λ for the proton, then use E = hc/λ to find the photon's energy. The calculation shows the energy is closest to 230 keV.

A Proton Has a Speed of 7