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level: Spectra

Questions and Answers List

level questions: Spectra

QuestionAnswer
What does each element producean individual line spectrum
how is a line emission spectrum producedwhen an electron is in an excited state in can return to a lower energy level when it does this it emits a photon different transitions produce different lines/frequencies of photons
How can a line spectrum be observedusing a spectrometer these can be used to identify the elements presence
why are some emission spectrum lines brighter than othersfor brighter lines, more electrons are making those transitions per second there are more photons per second emitted of that specific energy
what does the bohr model of the atom proposean atom has a central positively charged nucleus with electrons in orbits around the nucleus electron are only allowed in certain fixed orbits (energy levels) and not in the spaces between
what is ground state (Eo)the orbit nearest the nucleus where the electron has its lowest energy
what is meant by an excited stateelectrons in higher energy levels
what is ionisation levelthe energy at which an electron escapes from the electric field of the nucleus by convention the electron is said to have zero energy when this happens, meaning that the other levels have negative energy levels
what does an electron require to move up an energy levelenergy
what happens when an electron moves down an energy levelthe electron gives off energy as a photon
how many possible electron jumps are there in these energy levelssix this corresponds to six lines in the line spectrum
what happens to line spectrum if many electrons make the same jumpthe spectral line corresponding to that frequency will be bright because many photons are being emitted
what kind of spectrum does white light causea continuous spectrum when observed through a spectroscope or spectrometer
what happens when white light is passed through a coloured filter or a vapourthe frequencies of light corresponding to the energy level transitions for that material are absorbed this causes black lines on the continuous spectrum
what kind of spectrum is produced when the sun is observed through a spectroscopean absorption spectra
how are absorption lines producedgases present in the outer part of the sun absorb photons of a particular frequency
what do absorption lines on an absorption spectra correspond toemission lines of particular elements as a result elements present in the atmosphere of the sun can be identified
how can we make an electron drop down to a lower energy levelduring a process called stimulated emission of radiation LASER is an example of a device which uses this process
how does a laser workenergy supplied to the material the laser is made from causes electrons to become excited a photon of light stimulates these electrons to drop down to a lower energy level, releasing more photons these photons have the same frequency, same direction and are in phase with the photon causing their release, so are coherent more and more photons are emitted, creating the laser beam part of the beam is reflected back inside the laser energy is supplied to the laser to cause electrons to go back to a higher energy level. The reflected photons are used to keep the process going.
is a laser beam monochromatic?yes it is intense at does not spread out in the same way as a point source