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# Act_15 - Name Section Activity 15 Energy in Nature 15.1 The...

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2/24/05 1 Name: ___________________________________ Section: ______________ Activity 15: Energy in Nature 15.1 The Earth-Sun System 1) Energy from the sun Observe the models of the Earth, Moon, and Sun in the room. a) Imagine that the distance between the Earth and the Sun is represented by the length of a football field (100 yards or 91 meters). Choosing this distance to set the scale, the Sun, at one goal line, is represented by a ball 85 cm in diameter (the size of a large beach ball or exercise ball). What would be the diameter of a model of the Earth at the opposite goal line? What would be the diameter of a model of the Moon? _ ________ How far would the model of the Moon be from the model of the Earth? _ _____ _ b) It takes radiation from the Sun about 8.3 minutes to reach the Earth. How far away is the Earth from the Sun? 2) How much energy does the Earth receive from the Sun? a) How many watts of energy does the Sun produce? _ ______________ _ b) Only a small fraction of this energy actually reaches the outer atmosphere of the Earth. If this energy is about 1.76 x 10 17 watts, what percent is this of the total energy produced by the Sun? c) Where does the rest of the Sun’s energy go? d) What is the source of the Sun's energy? 3) What form of energy is received from the Sun? a) What form of energy does the sun give off?

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2/24/05 2 b) We now review the spectrum of a light bulb filament at different temperatures. Look at the filament through a diffraction grating.
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Act_15 - Name Section Activity 15 Energy in Nature 15.1 The...

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