Question

The de Broglie wavelength associated with a particle at rest is

Answer 1

The relationship between de Broglie wavelength $\left(\lambda \right)$ and the momentum $\left(p\right)$ of a photon is given by:
$\lambda =\frac{h}{p}$. So, the de Broglie wavelength associated with a particle at rest $(p=0)$ is infinity.

So, the answer is option (B).