( It ( ( ( turns out ) ( that ( ( ( a photon ) ( of ( ( wavelengths 656 ) nm ) ) ) ( ( has just ) ( the ( right ( energy ( to ( ( cause ( ( an electron ) ( of ( a ( hydrogen atom ) ) ) ) ) ( to ( ( make ( a transition ) ) ( from ( ( the second ) ( to ( the ( third orbit ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ turns) (PRT (RP out)) (SBAR (IN that) (S (NP (NP (DT a) (NN photon)) (PP (IN of) (NP (QP (CD wavelengths) (CD 656)) (NN nm)))) (VP (VBZ has) (ADVP (RB just)) (NP (DT the) (JJ right) (NN energy) (S (VP (TO to) (VP (VB cause) (NP (NP (DT an) (NN electron)) (PP (IN of) (NP (DT a) (NN hydrogen) (NN atom)))) (S (VP (TO to) (VP (VB make) (NP (DT a) (NN transition)) (PP (IN from) (NP (NP (DT the) (NN second)) (PP (TO to) (NP (DT the) (JJ third) (NN orbit)))))))))))))))) (. .)))
It turns out that a photon of wavelengths 656 nm has just the right energy to cause an electron of a hydrogen atom to make a transition from the second to the third orbit.
(ROOT (S (NP (DT The) (NN spectrum)) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (JJ discrete) (NNS lines)) (VP (VBG representing) (NP (NP (NNS transitions)) (PP (IN of) (NP (NP (DT the) (NN hydrogen) (NN electron)) (PP (IN between) (NP (JJ specific) (NN energy) (NNS levels)))))) (PP (IN within) (NP (DT the) (NN atom)))))))) (. .)))