Sunlight

What is Sunlight?

Sunlight is the electromagnetic radiation emitted by the Sun, particularly in the visible and ultraviolet light spectrum. It provides the energy that sustains life on Earth and drives the Earth's climate and weather.

Composition of Sunlight

Sunlight consists of a spectrum of different wavelengths of light, including infrared, visible, and ultraviolet light. This spectrum is important for various biological and physical processes on Earth.

Effects of Sunlight

Sunlight has several important effects on Earth, including:

• Photosynthesis in plants, which converts sunlight into chemical energy
• Regulation of the Earth's temperature and climate
• Formation of vitamin D in human skin through exposure to ultraviolet light

Measuring Sunlight

Sunlight can be measured using instruments such as solarimeters, pyranometers, and spectroradiometers. These tools help scientists quantify the amount and characteristics of sunlight at different locations and times.

Study Guide Questions

1. What is sunlight and where does it come from?
2. Describe the composition of sunlight and its different wavelengths.
3. Explain the importance of sunlight for plants and photosynthesis.
4. How does sunlight impact the Earth's climate and temperature?
5. What are some ways to measure sunlight?