<P> Spectroscopy can detect a much wider region of the EM spectrum than the visible range of 400 nm to 700 nm . A common laboratory spectroscope can detect wavelengths from 2 nm to 2500 nm . Detailed information about the physical properties of objects, gases, or even stars can be obtained from this type of device . Spectroscopes are widely used in astrophysics . For example, many hydrogen atoms emit a radio wave photon that has a wavelength of 21.12 cm . Also, frequencies of 30 Hz and below can be produced by and are important in the study of certain stellar nebulae and frequencies as high as 7027290000000000000 ♠ 2.9 × 10 Hz have been detected from astrophysical sources . </P> <P> The types of electromagnetic radiation are broadly classified into the following classes (regions, bands or types): </P> <Ol> <Li> Gamma radiation </Li> <Li> X-ray radiation </Li> <Li> Ultraviolet radiation </Li> <Li> Visible radiation </Li> <Li> Infrared radiation </Li> <Li> Terahertz radiation </Li> <Li> Microwave radiation </Li> <Li> Radio waves </Li> </Ol> <P> This classification goes in the increasing order of wavelength, which is characteristic of the type of radiation . </P>

What are the different regions of electromagnetic spectrum