Question 3:
Most of the sources of energy we use represent stored solar energy. Which of the
following is not ultimately derived from the Sun’s energy?
(a) Geothermal energy
(b) Wind energy
(c) Nuclear energy
(d) Bio-mass
Answer:
(c) Nuclear energy is released during nuclear fission and fusion. In nuclear fission,
uranium atom is bombarded with low-energy neutrons. Hence, uranium atom splits
into two relatively lighter nuclei. This reaction produces huge amount of energy. In
nuclear fusion reaction, lighter nuclei are fused together to form a relatively heavier
nuclei. The energy required to fuse the lighter nuclei is provided by fission reactions.
This reaction produces tremendous amount of energy. These reactions can be carried
out in the absence or presence of sunlight. There is no effect of sunlight on these
reactions. Hence, nuclear energy is not ultimately derived from Sun’s energy.
Geothermal energy, wind energy, and bio-mass are all ultimately derived from solar
energy.
Geothermal energy is stored deep inside the earth’s crust in the form of heat energy.
The heating is caused by the absorption of atmospheric and oceanic heat. It is the
sunlight that heats the atmosphere and oceans.
Wind energy is harnessed from the blowing of winds. The uneven heating of the
earth’s surface by the Sun causes wind.
Bio-mass is derived from dead plants and animal wastes. Chemical changes occur in
these dead plants and animal wastes in the presence of water and sunlight. Hence,
bio-mass is indirectly related to sunlight.
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