An electron and a proton have the same kinetic energy.
What is the ratio de Broglie wavelength of the electronde Broglie wavelength of the proton\displaystyle \frac{\text{de Broglie wavelength of the electron}}{\text{de Broglie wavelength of the proton}}de Broglie wavelength of the protonde Broglie wavelength of the electron?
5.4×10−45.4 \times 10^{-4}5.4×10−4
2.3×10−22.3 \times 10^{-2}2.3×10−2
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