[2] The solar radiation that reaches Earth is composed by 50% visible, 40% near

Question

[2] The solar radiation that reaches Earth is composed by 50% visible, 40% near IR and 10 UV.

The solar radiation that reaches Earth is composed by 50% visible, 40% near IR and 10 UV A) I. Which one is the most important source of thermal energy? B) Which one is the most important for the formation of atmospheric Ozone? What is the surface temperature of the Sun, what is the average surface temperature of Earth? What does represent the difference between these two values? 2. 3. What in principle would happen if all greenhouse gases are removed from the atmosphere?

Explanation / Answer

Ans 1)

A) Infra red radiations are the most important source of thermal energy.

Explanation - When a black body is heated, it radiates its energy in the form of radiations whose wavelength ranges from the longest infra red, passing through the visible range and a little amount of small wavelength uv radiations. How ever, IR dominates the net composition of thermal radiations.

B) UV radiations are needed for the formation of atmospheric ozone.

Explanation - UV breaks down an oxygen molecule into two oxygen radicals. This radical further reacts with another oxygen molecule to form an ozone molecule.

Ans 2) The surface temperature of the sun is 5778 K. The average surface temperature of the Earth is around 288 K. The difference represents the state of the two bodies. Continuous nuclear reactions in the sun is causing such a high temperature. On the other hand, the Earth's surface is relatively cooler. All the nuclear reactions are confined to the core.

Ans 3) If all the green house gases would be removed from the atmosphere, then the Earth would go back to another ice age.

Explanation - The green house gases as the name suggests, helps in maintaining the global temperature. They keep the Earth warm enough for living organism to survive. Without them the temperature would fall to such an extent that most living beings would perish.

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