Chemistry - Atomic Structure Question with Solution | TestHub

m = 40 g = 0.040 kg.

$\Delta v=h/(4\pi m\Delta x)=6.6\times 10^{-34}/(4\times 3.14\times 0.040\times 2\times 10^{-5})=6.6\times 10^{-34}/(1.005\times 10^{-5})=6.6\times 10^{-29}$ m/s.

Traps: using the mass in grams gives $6.6\times 10^{-26}$; using $h/(8\pi m\Delta x)$ gives $3.3\times 10^{-29}$.

Answer: (A).