Q. The spontaneous emission of radiation is more predominant in: a. Ultraviolet region,b. Optical region,c. Infrared region,d. Far infrared region.

Dear Student,
Bright district will have overwhelming unconstrained outflow of radiation since vitality of UV is significantly higher than the other locale. Vitality is specifically corresponding to recurrence. Higher recurrence of UV implies higher vitality. Consequently More unconstrained radiation discharge.