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$\text{Hint: } \lambda = \frac{h}{\text{mv}}$ $\text{From de Broglie's hypothesis, the momentum of a particle, p = h/}\lambda$ $\text{where h = Plank's constant and } \lambda \text{ = wavelength.}$ $\text{The relation between wavelength and } \frac{1}{\text{p}} \text{ is inverse.}$ $\text{So, the graph between the de Broglie wavelength and } \frac{1}{\text{p}} \text{ of a photon is a straight line because it follows a straight line equation, that is, y=mx.}$ $\text{According to de Broglie's equation: } p = \frac{h}{\lambda}$ $\text{This can be rewritten as: } \lambda = \frac{h}{p}$ $\text{This shows an inverse relationship between momentum (p) and wavelength (}\lambda\text{).}$ $\text{When p is plotted on y-axis and }\lambda\text{ on x-axis (as in option 1), we get a hyperbola (negative slope curve).}$ $\text{Since } \lambda \propto \frac{1}{p}\text{, the correct graph would show p decreasing as }\lambda\text{ increases.}$ $\text{Option 1 correctly shows this inverse relationship with a curve having negative slope.}$