What is the de Broglie wavelength (in nm) associated with a 2.5 g ping pong ball traveling 35 mph?

Answer 1

Wavelength = h / m*v

We want to make sure all of the units cancel out:

h = 6.62607004 × 10^-34 m2 kg / s

v = 35 mph = 15.65 m/s

m = 2.5 g = 0.0025 kg

Wavelength = (6.62607004 × 10-34 m2 kg / s) / (0.0025 kg * 15.65 m/s) = 1.6935642 x 10^-32 m = 1.6935642 x 10^-23 nm