What effect does a lower solar altitude have on solar radiation?

• A. It increases solar intensity
• B. It decreases solar intensity
• C. It disperses solar radiation
• D. It has no effect

Answer: (C)

A lower solar altitude results in a decrease in solar intensity. When the sun is lower in the sky, the sunlight has to travel through a greater thickness of the Earth's atmosphere before it reaches the surface. This increased distance causes more scattering and absorption of the solar radiation, leading to a reduction in the intensity of solar energy that reaches the ground.

When the sun is at a higher altitude, the rays of sunlight strike the surface more directly, concentrating the energy and increasing its intensity. Conversely, at lower altitudes, the rays are spread over a larger area and are less concentrated, resulting in a weaker solar intensity. This principle is particularly evident during early morning or late afternoon when the sun is lower on the horizon compared to midday when it is higher.

Understanding this concept is critical for fields like agriculture, solar energy, and climate science, where the intensity of solar radiation plays a crucial role in energy production, plant growth, and temperature dynamics.