Which angle results in a smaller warmed surface and higher intensity of solar radiation?

• A. 0 degrees
• B. 45 degrees
• C. 60 degrees
• D. 90 degrees

Answer: (D)

The angle that results in a smaller warmed surface and higher intensity of solar radiation is 90 degrees. When solar rays strike the Earth's surface at a 90-degree angle, they are hitting the surface directly and uniformly, which means the energy from the sun is concentrated over a smaller area. This concentrated exposure leads to higher intensity of solar radiation as more energy is delivered to each unit of surface area.

At this angle, there is minimal spread of sunlight over the area, allowing for more effective heating of that particular spot. In contrast, as the angle decreases and solar rays hit the surface more obliquely, the same amount of sunlight spreads over a larger area, resulting in a lower intensity of solar radiation and a larger warmed surface area. This principle is fundamental in understanding how solar energy is distributed and is crucial for applications such as solar panel placement and agricultural practices.