$($a$)$ Write a matlab script and plot a similar figure as Fig. $5?$ The temperature sweep is start from $1000K$ to $5000K$ with the interval of $500K.$ The wavelength sweep is from $0$ to $5m$ with an interval of $0\mathrm{.}2m.$

$($b$)$ Briefly explain the relation of the temeprature and color. $($Heat Transfer and Matlab$)$