What is the speed of an argon atom that has a de Broglie wavelength of 5.2 pm? A)0.52 m/s B)5.2  10³ m/s C)1.9  10³ m/s D)1.9 m/s E)25 m/s

Question

Quizplus · Accepted Answer

The de Broglie wavelength of a particle is given by λ = h/mv, where h is Planck's constant, m is the mass of the particle, and v is its velocity. Rearranging the equation, we get v = h/(mλ). 
Substituting the given values, we get v = (6.626 x 10^-34 J.s)/[(39.948 g/mol)/(6.022 x 10^23/mol) x 5.2 x10^-12 m] 
Simplifying, we get v = 1.89 x 10^3 m/s, which is closest to choice C: 1.9 x 10^3 m/s.

What Is the Speed of an Argon Atom That Has