MCQOPTIONS
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				| 1. | 
                                    The most familiar form of radiant energy in sunlight that causes tanning and sun burning of human skin, is called [CDS] | 
                            
| A. | ultraviolet radiation | 
| B. | visible radiation | 
| C. | infrared radiation | 
| D. | microwave radiation | 
| Answer» B. visible radiation | |