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प्रश्न
Name two energy sources that you would consider to be renewable. Give reasons for your choices.
उत्तर
wo renewable sources of energy are :
→ Sun: The energy derived from the Sun is known as solar energy. Solar energy is produced by the fusion of hydrogen into helium, fusion of helium into other heavy elements, and so on. A large amount of hydrogen and helium is present in the Sun. The Sun has billions years more to burn. Therefore solar energy is a renewable source of energy.
→ Wind: Wind energy is derived from fast blowing air. Wind energy is harnessed by windmills in order to generate electricity. Air blows because of uneven heating of the Earth. Since the heating of the Earth will continue forever therefore wind energy will also be available forever.
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Tidal energy is one of the forms in which solar energy manifests itself in oceans.
The non-renewable source of energy among the following is:
(a) hydroelectricity
(b) sewage gas
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(b) conversion of carbon fuel into carbon dioxide
(c) burning of hydrogen gas present in the sun
(d) disintegration of uranium into barium and krypton
Choose the correct answer.
Windmills have been used for many centuries in
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