Question

3
Raj got a watch that glowed in the dark. How do some non-luminous objects glow in the dark?​

Answer 1

Answer:

Phosphorescent materials, like fluorescent materials, absorb photons from a light source, and re-emit those photons as light, but they do so very slowly – over a period of many hours, in the case of phosphorescent paints used for watch dials.

Answer 2

Answer: Some substances such as radium emit radiations but not light

the watch contained a minute quantity of radium(radium is a non - luminous object as it does not emit light)