Hallwachs: zinc plate loses negative charge in UVहॉलवाक्स: पराबैंगनी प्रकाश में जिंक प्लेट का ऋण आवेश घटता हैHallwachs: zinc plate loses negative charge in UV
NCERT Sec 11.3.2 · Class 12 Physics · Chapter 11 · interactive diagram
Read Chapter 11 with this diagramइस डायग्राम के साथ अध्याय 11 पढ़ेंIs diagram ke saath Ch 11 padhiyeAll Physics diagramsसभी भौतिकी डायग्रामSaare Physics diagrams
Parts and what they mean
- Zinc plate (जिंक प्लेट) — Connected to the electroscope; here it is negatively charged.
- Gold-leaf electroscope (स्वर्णपत्र विद्युतदर्शी) — Its leaves spread apart when it is charged and fall when the charge is lost.
- Leaves diverged (पत्र फैले हुए) — Like charges on the two leaves repel: the plate is charged.
- Leaves collapse (पत्र सिकुड़ जाते हैं) — The negatively charged plate loses its charge in ultraviolet light, so the leaves fall.
- Ultraviolet light (पराबैंगनी प्रकाश) — UV light ejects negatively charged particles (electrons) from the zinc. An uncharged zinc plate even becomes positively charged.
- Ejected electrons (निकले हुए इलेक्ट्रॉन) — Hallwachs concluded that negatively charged particles are emitted; after 1897 they were known to be electrons.
Original diagram drawn by Simple Learning Hub, based on NCERT Sec 11.3.2. Report a mistake