To solve this problem, we need to understand the relationship between momentum $(P)$ and the de Broglie wavelength $(\lambda). \\ \\$The de Broglie wavelength is given by the formula:$\\ \lambda = \frac{h}{P} \\$where $h$ is Planck's constant and $P$ is the momentum of the particle.$\\ \\$From the formula, we can see that $\lambda$ is inversely proportional to $P. \\$This means that as the momentum increases, the wavelength decreases, and vice versa.$\\ \\$Let's analyze the options:$\\ \\$• Option 1: The graph shows an increasing curve, which suggests that as $\lambda$ increases, $P$ also increases. This is incorrect.$\\ \\$• Option 2: The graph shows a linear decrease, which suggests a direct inverse relationship. This is correct.$\\ \\$• Option 3: The graph shows a decreasing curve, which suggests that as $\lambda$ increases, $P$ decreases. This is also correct.$\\ \\$• Option 4: The graph shows an increasing linear relationship, which is incorrect.$\\ \\$The correct graph should show a decrease in $P$ as $\lambda$ increases, which is represented by Option 3.$\\ \\$Therefore, the correct option is Option 3.