Identify the part of the electromagnetic specturm which is
(i) Suitable for radar systems used in aircraft nevigation
(ii) Adjacent to the low frequency end of the electromagnetic spectrum
(iii) produced in nuclear reaction
(iv) produced by bombarding a metal target by high speed electrons.

Explanation

To solve the question, we need to identify specific parts of the electromagnetic spectrum based on the given criteria. Let's break down each part step by step:

### Step 1: Identify the part of the electromagnetic spectrum suitable for radar systems used in aircraft navigation.
- **Solution**: The part of the electromagnetic spectrum suitable for radar systems used in aircraft navigation is **Microwaves**. Microwaves are used in radar technology due to their ability to penetrate the atmosphere and provide accurate distance measurements.

### Step 2: Identify the part of the electromagnetic spectrum adjacent to the low frequency end.
- **Solution**: The part of the electromagnetic spectrum that is adjacent to the low frequency end is **Radio Waves**. Radio waves have the longest wavelengths and the lowest frequencies in the electromagnetic spectrum.

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