Which one of the following pairs of rays is electromagnetic in nature?

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Q: 67 (NDA-I/2010)

Which one of the following pairs of rays is electromagnetic in nature?

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,26,41,17,7,17,26

keywords: 

{'gamma rays': [1, 0, 4, 0], 'alpha rays': [0, 1, 2, 0], 'cathode rays': [0, 0, 0, 3], 'beta rays': [0, 1, 2, 0], 'rays': [0, 0, 1, 0], 'nature': [5, 1, 15, 25]}