(a) Identify the part of electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
(b) Prove that average energy density of the oscillating electric field is equal to that of oscillating magnetic field.

Explanation

### Step-by-Step Solution:

**(a)** Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery, along with their frequency ranges.

1. **Radar**: The part of the electromagnetic spectrum used in radar is **Microwaves**.
- **Frequency Range**: The frequency range for microwaves is approximately \(10^{10}\) Hz to \(10^{12}\) Hz.

2. **Eye Surgery**: The part of the electromagnetic spectrum used in eye surgery is **Ultraviolet (UV) Radiation**.
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