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    				| 1. | 
                                    Suggest one way, in each case, by which we can detect the presence of:(1) Infrared radiations (2) Ultraviolet radiations | 
                            
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Answer»  (1) Infrared radiations : These are detected by a thermopile. (2) Ultraviolet radiation : when a silver chlortile solution is taken in a test tube and is passed from red to violet light no change is seen. But beyond the violet end. the solution first turns violet and then it turns dark brown.  | 
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