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What are directivity and radar cross srction?
Radar cross section is a measure of the electromagnetic energy intercepted and reradiated at the same frequency
How much of the suns reflected energy is reradiated back into space?
Approximately 30% of the Sun's energy that reaches Earth is reflected back into space by clouds, atmospheric particles, and Earth's surface. This reflected energy is known as the albedo effect. The remaining energy is absorbed by the Earth, warming the planet and driving various processes, such as weather and climate. Ultimately, a portion of the absorbed energy is reradiated back into space as infrared radiation.
What absorbed energy is reradiated some of which escapes into space?
The absorbed energy that is reradiated, some of which escapes into space, primarily refers to the Earth's thermal radiation. When the Earth absorbs sunlight, it warms up and subsequently emits infrared radiation. This process helps regulate the planet's temperature, but not all of this emitted energy remains trapped; a portion escapes into space, contributing to the balance of energy between the Earth and its atmosphere. This energy exchange is crucial for maintaining the Earth's climate system.
How would you describe the wavelengths of incoming solar radiation compared to the wavelengths of reradiated heat?
The wavelengths of incoming solar radiation are shorter than the wavelengths of reradiated heat.
How does light cause global warming?
Energy comes from the sun principally in the form of visible light. When it passes through the earth's atmosphere and reaches the earth, this energy causes the surface to warm. The heat is then reradiated back into space as infrared radiation, or what we simply call heat. But some of this radiation is blocked by greenhouse gases, which prevent it from escaping into space, thus keeping the earth warmer than it otherwise would be. Finally, by increasing the amount of greenhouse gases in the air, we humans are creating an enhanced greenhouse effect, resulting in global warming.
layers of the at?
The atmosphere can be divided into five layers based on temperature variations. The layer closest to the Earth is called the troposphere. Above this layer is the stratosphere, followed by the mesosphere, then the thermosphere. The upper boundaries between these layers are known as the tropopause, the stratopause, and the mesopause, respectively. Temperature variations in the four layers are due to the way solar energy is absorbed as it moves downward through the atmosphere. The Earth’s surface is the primary absorber of solar energy. Some of this energy is reradiated by the Earth as heat, which warms the overlying troposphere. The global average temperature in the troposphere rapidly decreases with altitude until the tropopause, the boundary between the troposphere and the stratosphere.
The greenhouse effect gets its name from the florist's greenhouse where glass prevents reradiated solar energy from escapingGlass is transparent to visiblewaves and opaque to ultraviolet and infrare?
The greenhouse effect is named after a florist's greenhouse because, like the glass structure, Earth's atmosphere allows sunlight to enter but traps heat by preventing some of the energy from escaping. Glass is transparent to visible light, allowing sunlight to penetrate, while it is opaque to ultraviolet and infrared radiation, preventing heat from easily escaping. This mechanism keeps the interior of the greenhouse warm, similar to how Earth's atmosphere helps maintain a stable temperature conducive to life.
What wavelength of radiation is reradiated by the Earth upward?
The Earth reradiates longwave infrared radiation, with a peak wavelength around 10 micrometers. This is due to the Earth's relatively cool temperature compared to the Sun, causing it to emit radiation in the infrared part of the electromagnetic spectrum.
Is most of the sun energy reflected back into space?
Actually, a good portion of it is. The Earth's atmosphere absorbs many frequencies, though fortunately for Astronomers, not visible light. Where the light hits the oceans much of that energy is absorbed. Trees and other plant life have evolved to deliberately absorb energy from sunlight (photosynthesis) - that is their energy source. Clouds, on the other hand, are highly reflective, and contributes to Earth's relatively high Albedo (reflectivity) of 39%. Cloudy planets (Venus, Jupiter) have much higher albedos (Venus is 65%, Jupiter is 52%). The reason Venus is so hot anyway is that it gets hammered by twice as much solar radiation per unit area as Earth does, and the energy it doesn't reflect is hoarded by the carbon dioxide atmosphere. On the other hand, Earth radiates much spare heat into space as infrared energy. A: Most solar energy is reradiated. I'm not certain what percent is simply reflected. Cloud cover and ice fields reflect a lot of sunlight. Sandy deserts and alkaline salt flats also reflect a lot of light. Dark oceans and forests tend to absorb a considerable amount of solar energy.
Why does greenhouse effect result in warmer temperatures near the surface of the earth?
The greenhouse effect works by allowing some wavelengths of electromagnetic radiation to pass inwards (light for instance) and partially blocking other wavelengths passing outwards (infra-red or heat for instance). In a greenhouse the glass does this, with the earth there are certain gasses that are responsible, most notably water vapour and carbon dioxide.
What are examples of what type of energy?
* thermal energy * chemical energy * nuclear energy * mechanical energy * magnetic energy * electrical energy * radiant energy * elastic energy * sound energy * luminous energy * gravitational energy
8 different types of energy?
here are some: -Linear Kinetic energy -Rotational Kinetic energy -Heat energy -Atomic energy -Electrical energy -Sound energy -Solar energy -Wind energy -Tidal energy -Wave energy -Hydro energy -Nuclear energy -Succesive ionization energy
