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# State the parts of e.m spectrum to which $2.7 \;k$ (temperature with isotropic radiation filly all space - through to be a relic of the big bang origin of the universe ).

$\begin{array}{1 1} micro\;waves \\ radio\;waves \\ u.v\;rays \\ x-rays \end{array}$

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Solution :
$T= 27^{\circ}k$
$\lambda _mT = 0.29$ an $^{\circ}k$
$\lambda_m= \large\frac{0.29}{7}$
$\qquad= \large\frac{0.29}{7}$
$\qquad= 0.11\;cm$
This wave length corresponds to microwaves region of the e.m spectrum