The frequency of plane electromagnetic wave moving in positive Z- direction is `6.2 xx 10^(14) Hz.` Determine the average energy density of electric field if electric field at any point varies sinusoidal with amplitude of 1.4 `V m^(-1)`

Explanation

To determine the average energy density of the electric field in a plane electromagnetic wave, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Given Values**:
- Frequency of the electromagnetic wave, \( f = 6.2 \times 10^{14} \, \text{Hz} \) (not directly needed for this calculation).
- Amplitude of the electric field, \( E_0 = 1.4 \, \text{V/m} \).

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