( ( their wavelength ) ( ( ( is ( longer ( than visible ) ) ) light ) . ) )
(ROOT (S (NP (PRP$ their) (NN wavelength)) (VP (VBZ is) (ADVP (RB longer) (PP (IN than) (ADJP (JJ visible)))) (ADJP (JJ light))) (. .)))
their wavelength is longer than visible light.
(ROOT (S (NP (JJ Exact) (NN wavelength)) (VP (VBZ determines) (NP (NP (DT the) (NN color)) (PP (IN of) (NP (JJ visible) (NN light))))) (. .)))