Question

3) The energy from the sun that reaches the surface of the earth is about 900 W/m2

Answer 1

The energy from the sun that reaches the surface of the earth is about 900 W/m2 while actual sun radiation is  1360 W/m. This is because of the Earth's atmosphere layers. This is further explained below.

What are Earth's atmosphere layers?

Generally, there are five primary layers and a number of tertiary layers in the Earth's atmosphere. The troposphere, stratosphere, mesosphere, thermosphere, and exosphere are the principal layers of the atmosphere, from the lowest to the highest.

In conclusion, As a result, only roughly 900 W/m2 of the total 1360 W/m of solar radiation actually reaches Earth's surface. This is due to the layered composition of Earth's atmosphere.

Read more about Earth's atmosphere layers

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