( ( ( Electromagnetic ( Wave ( Frequency Spectrum ) ) ) ( -LRB- ( ( Radio Waves ) -RRB- ) ) ) a. )
(ROOT (NP (NP (NNP Electromagnetic) (NNP Wave) (NNP Frequency) (NNP Spectrum)) (PRN (-LRB- -LRB-) (NP (NNP Radio) (NNP Waves)) (-RRB- -RRB-)) (NP (NN a.))))
Electromagnetic Wave Frequency Spectrum (Radio Waves) a.
(ROOT (S (NP (NNP Am) (NN radio) (NNS waves)) (VP (VBP exist) (PRT (RP in)) (NP (DT the) (ADJP (QP (CD 540) (TO to) (CD 1600))) (NN khz) (NN frequency) (NN range))) (. .)))