The ratio of SI unit to CGS unit of Plank’s constant is

Plank’s constant converted from SI to CGS

We know, $\text{h}=\frac{\text{Energy}}{\text{freghency}}={\text{unit is kgm}}^2{\text{s}}^{-2}\text{\hspace{0.17em}or\hspace{0.17em}Js}$Let us convert the S.I unit in to C.G.S

${\text{kgm}}^2{\text{s}}^{-1}=x{\text{\hspace{0.17em}g\hspace{0.17em}cm}}^2{\text{s}}^{-1}$

$\Rightarrow {10}^3\text{g}\times {\left({10}^2\text{cm}\right)}^2{\text{s}}^{-1}=x{\text{\hspace{0.17em}g\hspace{0.17em}cm}}^2{\text{s}}^{-1}$$\Rightarrow {10}^7=x$

$\therefore$ Ration of S.I unit of h to its C.G.S unit $={10}^7$