( 1.13 ( ( Use ( ( the terms ) ( of ( frequency ( , ( wavelength ( , ( ( amplitude and ) speed ) ) ) ) ) ) ) ) ( to ( describe waves ) ) ) )
(ROOT (FRAG (NP (CD 1.13)) (VP (VB Use) (NP (NP (DT the) (NNS terms)) (PP (IN of) (NP (NN frequency) (, ,) (NN wavelength) (, ,) (NN amplitude) (CC and) (NN speed)))) (S (VP (TO to) (VP (VB describe) (NP (NNS waves))))))))
1.13 Use the terms of frequency, wavelength, amplitude and speed to describe waves
(ROOT (S (NP (NP (DT The) (NN product)) (PP (IN of) (NP (NP (NP (DT a) (NN wave) (POS 's)) (NN wavelength)) (CC and) (NP (PRP$ its) (NN frequency))))) (VP (VBZ is) (NP (PRP$ its) (NN speed))) (. .)))