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Physics Question on Electromagnetic waves

Calculate the average energy density of an electromagnetic wave whose electric field is oscillating with amplitude 50  V/m50 \;V/m and frequency 5×10105 \times10^{10} HzHz :

A

2×10−6  J/m32 \times 10^{-6}\; J / m ^ 3

B

1.1×10−8  J/m31.1 \times 10^{-8}\; J /m ^ 3

C

3×10−7  J/m33 \times 10^{-7}\; J / m ^ 3

D

1.6×10−7  J/m31.6 \times 10^{-7} \;J /m ^ 3

Answer

1.1×10−8  J/m31.1 \times 10^{-8}\; J /m ^ 3

Explanation

Solution

The Correct Option is (B) : 1.1×10−8  J/m31.1 \times 10^{-8}\; J /m ^ 3