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EM spectroum

Electromagnetic spectrum

QuestionAnswer
Wave Waves are defined by velocity, wavelength, frequency and amplitude.
Crest peak of a wave
Trough lower peak of the wave
Wavelength distance between two continueous Troughs or Crests
symbol of wavelength Lembda
Unit of Wavelength nm = nano-meter
Amplitude The amplitude of the wave is represented by the letter 'a'. It is a measure of the intensity and is relatively unimportant.
Frequency The number of waves passing per second. or Cycle per second
Relation between wavelength and frequency frequency = speed of light /wavelength
Electromagnetic waves They are a form of radiation that travel though the universe.
Electromagnetic energy The energy carried by an electromagnetic wave depends on the wavelength - they are inversely proportional, i.e. the shorter the wavelength the higher the energy.
Energy of Electromagnetic radiations Electromagnetic radiations and frequency The energy is also directly proportional to the frequency of the wave. Higher frequency = greater energy.
Energy of electromagnetic radiations Electromagnetic radiations and wavelength The energy is also inversely proportional to the wavelength of the wave. Higherwavelength = greater energy.
Energy and frequency E = hf
What is "h" h = plank's constant (value on table 2 of databook)
Energy and wavelength E =hc/wavelength
decreasing order of frequency and energy Gamma rays, X-rays, Ultraviolet, Visible, Infrared, Microwaves, Radio waves
increasing order of wavelength and decreasing order of energy Gamma rays, X-rays, Ultraviolet, Visible, Infrared, Microwaves, Radio waves
Continuous spectrum A continuous spectrum in the visible region contains all the colours of the spectrum. This is what you are seeing in a rainbow, which is formedby there fraction of white light through a prism orwaterdroplets in rain
An absorption line spectrum This has black lines on a coloured background – certain frequencies/wavelengths of visible light are missing.
An emission line spectrum An emission line spectrum has coloured lines on a black background- only certain frequencies/wavelengths of visible light are visible.
Created by: saurabh86
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