3. What is the de Broglie wavelength of an oxygen molecule, O2, traveling at 521 m/s? Is the wavelength much smaller or much larger than the diameter of an atom (on the order of 100 pm)?

4. The mass of a helium atom is 4.0026 amu, and its average velocity at 25C is 1.36 103 m s-1. What is the uncertainty in meters in the position of a helium atom if the uncertainty in its velocity is 1.0%?