The doppler shift, also known as doppler effect, was
mentioned in the book, See What I’m Saying in the beginning chapters.
The doppler shift is the
change in frequency of a wave in relation to an observer who is moving relative
to the wave source. It is named after the Austrian physicist Christian
Doppler. An example of this is when an ambulance passes you with its siren blaring.
The frequencies change as the object moves further away or closer to the
observer. A mathematical formula can be used to determine the observed
frequency in the doppler shift. Blind people are able to interpret their
surroundings by using this method whether they know they are using it or not. The
doppler shift is often connected with the use of echolocation. The different frequencies
allow blind people to determine when it is safe to cross a road and etc.
https://imagine.gsfc.nasa.gov/features/yba/M31_velocity/spectrum/doppler_more.html
It interesting to see how the Doppler effect works and how it allows the blind to interpret their surroundings! Overall great post and very informative!
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