`X`-rays are not used for radar purooses, because they are not,

Options

A. they are not relfected by the target
B. they are not electromagnetic waves
C. they are completely absorbed by the air
D. they sometimes damage the target

Explanation

To solve the question of why X-rays are not used for radar purposes, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Radar Technology**:
- Radar (Radio Detection and Ranging) uses electromagnetic waves to detect objects and determine their distance. It relies on the reflection of these waves off objects.

2. **Nature of X-rays**:
- X-rays are a form of electromagnetic radiation with a very short wavelength, which allows them to penetrate materials rather than reflect off of them.

3. **Interaction of X-rays with Matter**:
- When X-rays hit a target, they are primarily absorbed by the material rather than being reflected. This absorption means that very little of the X-ray signal returns to the source.

4. **Conclusion on Radar Use**:
- Since radar systems depend on the reflection of waves to detect objects, the fact that X-rays are absorbed and not reflected makes them unsuitable for radar applications.

5. **Final Answer**:
- Therefore, X-rays are not used for radar purposes because they are not reflected by the target.