MCQOPTIONS
 Saved Bookmarks
				| 1. | 
                                    UV radiation can be produced by______________? | 
                            
| A. | Heating the filament | 
| B. | Electron excitation in the gas | 
| C. | Ionization of atoms | 
| D. | All the above | 
| Answer» C. Ionization of atoms | |