What is the speed of an argon atom that has a de Broglie wavelength of 5.2 pm?

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Answer 1 · 2015-04-04T21:36:06

$v=1.9xx10^2"m/s"$

1 $Ar$ atom has a mass of 39.948 amu

1 amu = $1.6605xx10^(-27)"kg"$

$lambda=(h)/(mv)$

$v=(h)/(mlambda)$

$v=(6.6326xx10^(-34))/(39.958xx1.6605xx10^(-27)xx5.2xx10^(-12))"m/s"$

$v=1.9229xx10^(2)"m/s"$