Sentence:  The observed intensity of the <WSD>radio</WSD> emission of Venus is much higher than the expected thermal intensity , although the spectrum indicated by measurements at wave lengths near 3 cm and 10 cm is like that of a black body at about 600 ` K . 
Meaning of the word marked with <WSD> tags:  an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m