MOD 5 LECTURE
In this lecture you will learn:
what the doppler effect is with sound and
waves of the EMS
DOPPLER EFFECT: SOUND
DOPPLER EFFECT: "SEEING" SOUND
|Here is example of how a sonic boom can
be seen and HERE
is a very good physics explanation
DOPPLER EFFECT: EMS
- THE DOPPLER LIGHT SHIFT
|The same thing is observed in light reaching
earth from other stars.
The spectrum is shifted towards the blue
end when it is approaching earth
The spectrum is shifted towards the red
when it is going away.
DOPPLER EFFECT: EMS - RADAR, WEATHER
RADAR (Radio Detection and Ranging)
Radar depends on waves of the EMS that
move out, bounce off some part of the car and are bounced back to the collector
that generates a report on the speed of the car, either approaching or
"Radar is an object detection system that
uses electromagnetic waves to identify the range, altitude, direction,
or speed of both moving and fixed objects such as aircraft, ships, motor
vehicles, weather formations, and terrain. The term RADAR was coined in
1941 as an acronym for radio detection and ranging. The term
has since entered the English language as a standard word, radar, losing
the capitalization. Radar was originally called RDF (Radio Direction Finder,
now used as a totally different device) in the United Kingdom."
RADAR can be any wave of the EMS altho
it says "radio" in fact other shorter wavelengths are used.
|WEATHER AND DOPPLER
How to interpret doppler signatures click
for explantion of this
"Idealized output of wind velocities has
analyzed by a Doppler radar which has a full coverage of targets over is
domain. The value of velocities varies with angle of view of the beam as
the radar its only noticing the radar component."
Draw a picture and explain the doppler
affect on sound when a train is coming towards and going away from a person.
What causes a sonic boom?
Draw and explain red and blue shift in
light reaching us from distant galaxies.
What kind of uses are doppler shifts in
waves of the EMS?