What is difference between spectrophotometry & spectroscopy?

Question

It is very confusing.

Answer 1

The first one relates to the examination ,and the second one to the instrument for conducting the examination.

Answer 2

Spectrophotometry is measuring intensity of light in a part of the spectrum specially as transmitted or emitted by particular substances This is measured using a spectrophotometer

Spectroscopy is the branch of scienceconcerned with the investigation and measurement spectra produced when matter interacts with or emits electromagnetic radiation.

In 1  you use a photometer to measure the intensity of the light which is given out by a substance or intensity of light emitted by it. Measurement involves wave lengths ,energies etc.

In 2   is included all methods of producing and analysing light spectra usingspectroscopes, spectrographs,spectrometersand spectrophotometers.

The interpretation of spectra so producedcan be used for chemical analysis, examining atomic and molecular energy levels and molecular structures

Reference Oxford dictionary of Physics

Answer 3

In physics, spectrophotometry is the quantitative study of electromagnetic spectra.

http://en.wikipedia.org/wiki/Spectrophot...

Spectroscopy was originally the study of the interaction between radiation and matter as a function of wavelength (λ). In fact, historically, spectroscopy referred to the use of visible light dispersed according to its wavelength, e.g. by a prism.

http://en.wikipedia.org/wiki/Spectroscop...