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# What is order of energy of X-rays $(E_X)$, radio waves $(E_R)$, and micro waves $(E_M)$?

$\begin {array} {1 1} (a)\;E_X < E_R < E_M & \quad (b)\;E_X > E_M > E_R \\ (c)\;E_X < E_R > E_M & \quad (d)\;E_X > E_R > E_M \end {array}$