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The average kinetic energy of an atom in a monatomic ideal gas is given by KE=3/2kT, where k=1.38*10^-23J/K and T is the Kelvin temperature of the gas. Determine the de Broglie wavelength of a helium atom (mass=6.65*10^-27kg) that has the average kinetic energy at room temperature (293K).

I don't get this question at all and I have no idea how to do it. I NEED HELP AND PLEASE EXPLAIN!THANKS A LOT!

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