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The Debrogile equation solves for wavelength using Planck's constant, the mass of a particle, and velocity. The velocity is given in the problem, and 9.10938356 × 10-31 kilograms is the mass of an electron (which can just be googled honestly). So you you just divide plancks constant by the velocity times the mass of he electron. You may be able to do it with kinetic energy ( I didn't try it) but using the Debrogile equation is much simpler.
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