Why fusion needs very high temperatureसंलयन के लिए बहुत उच्च ताप क्यों चाहिएWhy fusion needs very high temperature
NCERT Section 13.7.2 · Class 12 Physics · Chapter 13 · interactive diagram
Read Chapter 13 with this diagramइस डायग्राम के साथ अध्याय 13 पढ़ेंIs diagram ke saath Ch 13 padhiyeAll Physics diagramsसभी भौतिकी डायग्रामSaare Physics diagrams
Parts and what they mean
- Coulomb barrier (कूलॉम अवरोध) — Both nuclei are positive, so they repel. Potential energy = k(e)(e)/r rises as they come closer.
- Barrier height ≈ 400 keV (अवरोध की ऊँचाई ≈ 400 keV) — For two protons the barrier is about 400 keV (NCERT). It is higher for nuclei with more charge.
- Short-range nuclear attraction (लघु-परासी नाभिकीय आकर्षण) — Once the nuclei touch, the strong attractive nuclear force takes over and they can fuse.
- Typical thermal energy in the Sun (सूर्य में सामान्य तापीय ऊर्जा) — (3/2)kT at 1.5 × 10⁷ K ≈ 2 keV — far below 400 keV. Only the rare, much faster protons fuse (to reach 400 keV on average needs T ≈ 3 × 10⁹ K).
Original diagram drawn by Simple Learning Hub, based on NCERT Section 13.7.2. Report a mistake