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: The '''Doppler effect''' can be noticed when cars pass by at high [[speed]]. At the cars are moving towards the [[observer]] the [[sound]] will be higher [[pitch]]ed but the moment the car goes past the [[sound]] will suddenly be lower [[pitch]]ed.
: The '''Doppler effect''' can be seen in the [[Visible Light|visible light]] [[emit]]ted by [[object]]s moving at extremely high [[speed]]. [[Light]] from [[object]]s moving away form the [[observer]] will appear to be longer [[wavelength]] and is referred to as [[Red Shift]]ted]] while [[light]] from [[object]]s moving towards the [[observer]] will appear to be shorter [[wavelength]] and is referred to as [[Blue Shift]]ted.
{| class="wikitable"
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|[[File:DopplerEffect.png|center|400px]]
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| style="height:20px; width:200px; text-align:center;" |This image shows a red [[object]] moving to the left.
An [[observer]] on the left of the [[object]] would experience higher [[frequency]] and shorter [[wavelength]] [[wave]]s
An [[observer]] on the right of the [[object]] would experience lower [[frequency]] and longer [[wavelength]] [[wave]]s.
|}