Which of the Following Has the Smallest DeBroglie Wavelength

Which of the following has the smallest deBroglie wavelength?

A) an electron travelling at 80% the speed of light
B) a proton travelling at 20% the speed of light
C) a carbon nucleus travelling at 70% the speed of light
D) a helium nucleus travelling at 80% the speed of light
E) a lithium nucleus travelling at 50% the speed of light

Correct Answer:

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