The graph between wave number ($\overline{\mathrm{v}}$) and angular frequency ($\mathrm{\omega }$) is

(a) $\mathrm{\omega }=2\mathrm{\pi v}=\frac{2\mathrm{\pi c}}{\mathrm{\lambda }}=2\mathrm{\pi c}\overline{\mathrm{v}}⇒\mathrm{\omega }\propto \overline{\mathrm{v}}$

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