Which of the following brokeup water into hydrogen and oxygen on early earth?

Options

A. Visible light
B. Infrared radiations
C. Sunlight
D. UV radiations

Answer

To solve the question "Which of the following broke up water into hydrogen and oxygen on early earth?" we need to analyze the options provided:

1. **Visible Light**
2. **Infrared Radiation**
3. **Sunlight**
4. **UV Radiations**

### Step-by-Step Solution:

1. **Understanding the Process**: The question is asking about the breakdown of water (H2O) into hydrogen (H2) and oxygen (O2) on early Earth. This process is known as photolysis.

2. **Identifying the Role of Sunlight**: Photolysis of water occurs when water molecules are split into hydrogen and oxygen in the presence of light.

3. **Evaluating the Options**:
- **Visible Light**: While visible light is part of sunlight, it is not specifically responsible for the photolysis of water.
- **Infrared Radiation**: Infrared radiation does not have enough energy to break the bonds in water molecules.
- **Sunlight**: Sunlight includes a spectrum of light, including UV, visible, and infrared. It has the necessary energy to cause photolysis of water.
- **UV Radiations**: UV radiation can break down water into hydrogen and hydroxide ions, but it does not produce molecular oxygen.

4. **Conclusion**: Based on the analysis, the correct answer is **Sunlight**, as it encompasses the energy required for the photolysis of water into hydrogen and oxygen.

### Final Answer:
The correct answer is **Sunlight** (Option 3).

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