( ( ( ( ( ( This period ) ( of time ) ) , ) ( multiplied ( by ( ( the speed ) ( of light ) ) ) ) ) , ) ( ( was ( described ( as ( ( ( the ( impulse width ) ) , ) ( ( a quantity ) ( which ( , ( ( if ( ( ( the nature ) ( of ( the X-rays ) ) ) ( were ( ( the same ) ( as ( that ( of ( the ( light rays ) ) ) ) ) ) ) ) ) ( , ( would ( coincide ( with ( the wavelength ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT This) (NN period)) (PP (IN of) (NP (NN time))) (, ,) (VP (VBN multiplied) (PP (IN by) (NP (NP (DT the) (NN speed)) (PP (IN of) (NP (NN light)))))) (, ,)) (VP (VBD was) (VP (VBN described) (PP (IN as) (NP (NP (DT the) (NN impulse) (NN width)) (, ,) (NP (NP (DT a) (NN quantity)) (SBAR (WHNP (WDT which)) (S (, ,) (SBAR (IN if) (S (NP (NP (DT the) (NN nature)) (PP (IN of) (NP (DT the) (NNS X-rays)))) (VP (VBD were) (NP (NP (DT the) (JJ same)) (PP (IN as) (NP (NP (DT that)) (PP (IN of) (NP (DT the) (JJ light) (NNS rays))))))))) (, ,) (VP (MD would) (VP (VB coincide) (PP (IN with) (NP (DT the) (NN wavelength)))))))))))) (. .)))
This period of time, multiplied by the speed of light, was described as the impulse width, a quantity which, if the nature of the X-rays were the same as that of the light rays, would coincide with the wavelength.
(ROOT (S (NP (NNP Impulse)) (VP (VBZ is) (NP (NP (DT the) (NN quantity)) (PP (IN of) (NP (NP (NN force)) (VP (VBN multiplied) (PP (IN by) (NP (NP (DT the) (NN time)) (SBAR (S (NP (PRP it)) (VP (VBZ is) (VP (VBN applied)))))))))))) (. .)))