ICSE Class 10 Physics 2019 Solved Paper

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Question : 30
Total: 74
Why is a nuclear fusion reaction called a thermo nuclear reaction?
Solution:  
For a nuclear fusion reaction, a high temperature (107k) and high pressure is required. At such a high temperature, both nuclei due to their thermal agitations acquire sufficient kinetic energy so as to overcome the force of repulsion between them when they approach each other, and so they get fused.
This is why the fusion reaction is also called the thermo-nuclear reaction.
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