Sentence:  The radio emission of a planet was first detected in 1955 , when Burke and Franklin ( 1955 ) identified the origin of interference like radio noise on their records at about 15 <WSD>meters</WSD> wave length as emission from Jupiter . 
Meaning of the word marked with <WSD> tags:  the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)