Q.3.In 1965 Penzias and Wilson discovered the cosmic microwave radiation left over from the Big Bang expansion of the universe. The energy density of this radiation is 7.27 � 10^?14 J/m3.The speed of light 2.99792 � 10^8 m/s and the permeability of free space is 4? �10^?7 N/A2.Determine the corresponding electric ?eld amplitude. Answer in units of V/m.

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