$A$ black body has a maximum wavelength of $\lambda_m$ at a temperature of $2000 \ K$. What will be the maximum wavelength at a temperature of $3000 \ K$?
- A$\frac{3}{2} \lambda_m$
- B$\frac{2}{3} \lambda_m$
- C$\frac{4}{9} \lambda_m$
- D$\frac{9}{4} \lambda_m$
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