What is the de Broglie wavelength of a baseball (mass 145 g)travelling at major league fastball speeds (99 mph)?

Question

Quizplus · Accepted Answer

The de Broglie wavelength ($\lambda$) of an object is given by the equation $\lambda = \frac{h}{mv}$, where $h$ is Planck's constant ($6.626 \times 10^{-34} \, \text{m}^2\text{kg}/\text{s}$), $m$ is the mass of the object, and $v$ is the velocity of the object. Converting the mass of the baseball to kilograms ($0.145 \, \text{kg}$) and the velocity from mph to m/s ($99 \, \text{mph} \approx 44.2 \, \text{m/s}$), and then substituting these values into the equation, yields a wavelength on the order of $10^{-34}$ meters, which matches choice A.

What Is the De Broglie Wavelength of a Baseball (Mass