Which of the following objects, all moving at the same speed, will have the longest de Broglie wavelength?

Question

Quizplus · Accepted Answer

The de Broglie wavelength ($\lambda$) is given by $\lambda = \frac{h}{mv}$, where $h$ is Planck's constant, $m$ is the mass of the particle, and $v$ is its velocity. Since all objects are moving at the same speed, the object with the smallest mass will have the longest wavelength. Among the given options, an electron has the smallest mass, hence it will have the longest de Broglie wavelength.

Which of the Following Objects, All Moving at the Same