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Nuclear fusion needs which condition that makes it hard to use on Earth?
AVacuum by common convention in standard practice
BMagnetic field of any strength
CExtremely high temperatures (tens of millions of degrees)
DSteady sunlight in standard practice
Answer & Solution
Correct answer: C. Extremely high temperatures (tens of millions of degrees)
1. In fusion two light nuclei must approach close enough to merge.
2. Both carry positive charges and repel strongly.
3. Overcoming this repulsion needs kinetic energy of millions of electron-volts.
4. That translates into temperatures of tens of millions of degrees.
5. So sustaining fusion is difficult because of the extreme temperatures required.
6. The sun's core fuses hydrogen at about 15 million degrees.
_Source: NCERT Class 10 Science Ch 14 'Sources of Energy' (byjus.com extract)_
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