( ( Most ( of ( this energy ) ) ) ( ( is ( in ( ( the form ) ( of ( ( the ( kinetic energy ) ) ( of ( the ( emitted electron ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (DT this) (NN energy)))) (VP (VBZ is) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NP (DT the) (JJ kinetic) (NN energy)) (PP (IN of) (NP (DT the) (JJ emitted) (NN electron)))))))) (. .)))
Most of this energy is in the form of the kinetic energy of the emitted electron.
(ROOT (S (NP (JJ Moving) (NNS electrons)) (VP (VBP have) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NP (JJ kinetic) (NN energy)) (VP (VBN called) (NP (JJ electrical) (NN energy))))))) (. .)))