Discovery of the neutron (Chadwick, 1932)न्यूट्रॉन की खोज (चैडविक, 1932)Discovery of the neutron (Chadwick, 1932)
NCERT Section 13.2 · 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
- α source (α स्रोत) — Gives α-particles (helium nuclei, ⁴He: 2 protons + 2 neutrons).
- α-particles (α-कण) — Fast helium nuclei striking the beryllium.
- Beryllium target (बेरिलियम लक्ष्य) — Bombarded beryllium nuclei emit a highly penetrating neutral radiation.
- Neutral radiation = neutrons (उदासीन विकिरण = न्यूट्रॉन) — If it were photons, energy and momentum conservation needed far more energy than available. Chadwick showed it is a new neutral particle with mass ≈ proton mass.
- Target with light nuclei (हल्के नाभिकों वाला लक्ष्य) — The radiation knocked protons out of light nuclei such as helium, carbon and nitrogen.
- Knocked-out protons (बाहर निकले प्रोटॉन) — Their energies told Chadwick the mass of the neutral particle.
- Detector (संसूचक) — Counts the protons. Neutrons themselves leave no track because they have no charge.
Original diagram drawn by Simple Learning Hub, based on NCERT Section 13.2. Report a mistake