What is the approximate surface temperature of a Yellow star? Wiens's constant = 0.288 cmK

Wavelength of yellow light is $5500\stackrel{\text{o}}{\text{A}}$. By Wien's displacement law

$\lambda T=b\Rightarrow T=\frac{b}{\lambda }=\frac{0.288\times {10}^8}{5500}\stackrel{\text{o}}{\text{A}}={5236}^{o}K={4963}^{0}C$