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    				| 1. | 
                                    State three properties of ultra-violet radiations similar to visible light. | 
                            
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Answer»  (i) Ultra-violet radiations can travel in vacuum as the visible light can do, with the speed 3 × 108ms-1. (ii) Both the ultra-violet radiations and the visible light are electromagnetic waves. (iii) Both the ultra-violet radiations and the visible light obey the laws of reflection and refraction.  | 
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