Question

2. मोमबत्ती की ज्वाला जब स्थिर हो तो काँच के प्लेट ले जाने पर काला वलय क्यों
बनता है?​

Answer 1

Answer:

A circular blackish ring is formed on the glass plate/slide. It indicates the deposition of unburnt carbon particles present in the luminous zone of the flame. Hold a thin long copper wire just inside the flame for about 30 seconds. Notice that the portion of the copper wire just outside the flame gets red hot.