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Emission spectra
range of frequencies or wavelengths of electromagnetic radiation emitted during an electron transition from higher to lower energy levels
Electron transitions
the movement of an electron between the energy levels in an atom accompanied by the absorption or emission of energy
what are the seven regions of the electromagnetic spectrum
radio , microwave ,infrared , visible light, ultraviolet , X-ray, Gamma rays
what order are the 7 regions of the electromagnetic spectrum arranged by ?
they are arranged in the order of frequency , wavelength and energy with radio having the longest wavelength , lowest frequency and energy and gamma rays having the shortest wavelength and highest frequency and energy
what is wavelength ?
the distance from a point on one wave to the equivalent point on the adjacent wave. (measured in m)
what is frequency ?
the number of complete waves passing a point each second . ( measured in hertz Hz)
what is the relationship between energy, frequency and wavelength ?
wavelength and energy have an inversely proportionate relationship. Energy frequency and electromagnetic radiation are directionally proportionate.
describe the relationship between energy, frequency and wavelength ?
as wavelength shortens, frequency, energy and elm radiation increases , colour is closer to violet
as wavelength lengthens , frequency , energy and elm radiation decreases , colour is closer to red
what is a spectroscope ?
a device for viewing the emission spectra of elements in the visible region
emission line spectrum
produced when electrons transition from higher to lower energy levels emitting energy in the process .
line spectrum
only shows discrete specific wavelengths and frequencies of electromagnetic radiation
Continuous spectrum
shows all wavelengths and frequencies of visible light
what do the lines do on the spectrum?
The lines in the emission spectrum converge -get closer at higher energy so the lines between violet and blue are much closer and smaller than the lines between red and orange.
what is are the energy levels called and what letter are they assigned ?
they are the main energy levels, they are assigned the letter n which is called the principle quantem number
describe the main energy level order
n=1 is closest to the nucleus and has the lowest energy
n=6 - furtherest from the nucleus and has the highest energy
what are photons
electrons absorb energy in the form of photos which are elementary particle of discrete amounts of electromagnetic radiation which are small packets of energy
what does the amount of energy emitted depend on ?
it depends on the size of the transition of the electron i.e there is more energy emitted when the electron returns to n=2 from n=5 than is emitted when electron returns form n=3 to n=2 but both
