Which particle has the smallest de Broglie wavelength?
an electron moving at 2.5×104 m s−12.5 \times 10^4\text{ m s}^{-1}2.5×104 m s−1
a proton moving at 2.5×104 m s−12.5 \times 10^4\text{ m s}^{-1}2.5×104 m s−1
an electron moving at 5.0×106 m s−15.0 \times 10^6\text{ m s}^{-1}5.0×106 m s−1
a proton moving at 5.0×106 m s−15.0 \times 10^6\text{ m s}^{-1}5.0×106 m s−1
