Solar radiations reaching earth have a wavelength of

Options

A. 400-700 nm
B. 300-740 nm
C. 300-2600 nm
D. 300-16000 nm

Answer

To determine the wavelength of solar radiation reaching the Earth, we can follow these steps:

### Step 1: Understand the Spectrum of Solar Radiation
Solar radiation encompasses a range of wavelengths that can be categorized into different types of radiation: ultraviolet, visible light, and infrared radiation.

### Step 2: Identify the Wavelength Ranges
- **Ultraviolet Radiation**: This type of radiation has wavelengths ranging from 100 to 400 nanometers.
- **Visible Light**: This is the light that is visible to the human eye, with wavelengths ranging from 400 to 700 nanometers.
- **Infrared Radiation**: This radiation has wavelengths starting from 700 nanometers and can go beyond 1 millimeter.

### Step 3: Determine the Overall Range of Solar Radiation
The overall range of solar radiation that reaches the Earth is from about 100 nanometers to 1 millimeter, which includes all three types of radiation mentioned above.

### Step 4: Analyze the Given Options
The options provided are:
1. 400 to 700 nanometers
2. 300 to 740 nanometers
3. 300 to 2600 nanometers
4. 300 to 16000 nanometers

### Step 5: Select the Correct Option
Among the options, the range that encompasses the visible light (400 to 700 nanometers) and extends into the infrared range is 300 to 2600 nanometers. This range includes both visible light and infrared radiation, making it the most accurate choice.

### Final Answer
The correct answer is **300 to 2600 nanometers**.

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