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

1 Answer
Michael
Apr 4, 2015

#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"#

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