Answer:
<em>Fission</em> means breaking.
The process of combining two small nuclei is called <em>fusion</em>.
Explanation:
The process of breaking a heavy nuclei to form two or more lighter nuclei is called <em>Fission</em>.
The heavy nuclei ,like Uranium, are bombarded with slow moving electrons, which are known as thermal electrons. On bombarding, the nuclei disintegrates to form two or more smaller nuclei releasing a huge amount of energy in the process. Fusion is a exothermic process.
The process of fusion is used in nuclear reactors.
Example:
The process of combining two lighter nuclei to form a heavier nuclues is called Fusion.
Energy is released or absorbed during the process.
Fusion takes place in the sun.
Answer:
B. Planets orbit a star, while moons orbit a planet
Explanation:
Every planet must orbit a star, like how the Earth orbits the Sun (the star of our solar system). Our moon orbits Earth. On other planets, there can be dozens of moons orbiting it.
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Vertical line from the centre of mass is inside the base of the tower.
- Energy from the Sun that reaches the Earth
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