`CO_(2)` laser uses

Options

A. microwaves
B. infra red
C. ultra violet
D. visible light

Explanation

To solve the question regarding the use of CO₂ laser, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding CO₂ Laser**:
- The CO₂ laser is a type of gas laser that uses carbon dioxide (CO₂) as its active medium for producing laser light.

2. **Composition of the Laser**:
- The CO₂ laser consists of a mixture of gases, primarily carbon dioxide, along with nitrogen (N₂) and helium (He).
- Nitrogen is used to aid in energy transfer, while helium helps in maintaining the laser's efficiency.

3. **Energy Transfer Mechanism**:
- When electrical energy is applied to the gas mixture, nitrogen molecules become excited and transfer energy to the carbon dioxide molecules, raising them to an upper energy level.

4. **Type of Radiation Produced**:
- The energy transition that occurs in the CO₂ molecules results in the emission of infrared radiation.
- This is due to the specific energy levels of the CO₂ molecules, which emit light in the infrared spectrum when they return to lower energy states.

5. **Applications of CO₂ Laser**:
- CO₂ lasers are widely used in various applications, particularly in medical surgeries.
- They are especially effective in surgeries involving airway tissues, such as head and neck surgeries, due to their precision and ability to cut or vaporize tissue without significant damage to surrounding areas.

6. **Conclusion**:
- Therefore, the type of radiation used by CO₂ lasers is infrared radiation.

### Final Answer:
The CO₂ laser uses **infrared radiation**.

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