Q.No.125: - Define phosphorescent also describe the factors upon which it depends?

Q.No.125: - Define phosphorescent also describe the factors upon which it depends?

Ans: - Objects that continue to glow longer than 10^-8s after the source of the excitation is removed are called phosphorescent and the materials that cause this effect is called a phosphor. For example dial of clock. It depends on the duration of light emission after the source of excitation is removed.