P1252428557viSQd - PowerPoint PPT Presentation

Title: P1252428557viSQd


1
(No Transcript)
2
Christian Andreas Doppler
was born in 1803 in Salzburg, Austria, to a
family of successful stonemasons.
Salzburg is also the birthplace of Mozart who was
born in 1756, 47 years
earlier.
Austria
3
Christian was born at Makart Square 1 in a fine
house built by his familys stonemasonry business.
The Mozart family lived at Makart Square 8 when
Mozart was 17.
Doppler was expected to continue the family
tradition of stonemasonry.
4
Wolfgang Amadeus Mozart and Christian Andreas
Doppler are considered the most famous
individuals to come from Salzburg, Austria.
5
When Christian was 19, his parents - being unsure
of his academic potential - checked with a math
professor about his future.
It was recommended that he go to Vienna
Polytechnic Institute to study math.
He graduated 3 years later in 1822 and went to
the University of Vienna to pursue higher math,
mechanics, and astronomy.
6
The year Christian Doppler went to the University
of Vienna, Gregor Mendel was living as a 3 year
old toddler in a nearby Austrian town.
University of Vienna
Mendel attended the same university
29 years later in hopes of becoming a
math teacher.
7
Doppler began his teaching career in a temporary
position to a mathematics professor at the
University of Vienna.
During this time, he published 4 mathematics
papers.
He applied for permanent academic positions at
several schools/universities for several years.
8
While Doppler searched for academic employment,
he struggled financially as a bookkeeper at a
cotton spinning factory to make ends meet.
9
Finally, just as he had begun to sell his
possessions with the intent of emigrating to
America,
he received an offer at the Technical Secondary
School in Prague.
10
Teaching elementary mathematics was boring
Doppler applied for a position to teach higher
mathematics.
Doppler kept his math skills sharpened by also
working part time 4 hours a week at Vienna
Polytechnic Institute.
Meanwhile, a professorship in geometry and
mathematics became available at VPI and Doppler
filled in, assuming hed eventually get the job.
11
Although Doppler finally got the job, he had to
compete with several others for the position.
This hurt his feelings, and his fragile health
began to worsen.
The strain of teaching added more stress.
His students complained that his tests were too
harsh and unfair, and Doppler eventually
requested sick leave.
12
It was during these years that Doppler presented
a brilliant paper entitled On the coloured light
of the double stars and certain other stars of
the heavens to the Royal Bohemian Society in
Prague.
In other words...
13
Doppler theorized that sound and light waves
change if the source of the wave moves or if the
observer of the wave moves.
Doppler tested his theory by . . .
14
Railroad
Crossing
?
?
?
15
Doppler had a trumpeter stand on a moving train
for 2 days, playing the same note, while trained
musicians recorded the difference in sound.
At first, Doppler did not convince everyone of
his theory.
Many opponents argued his theory and he
eventually published a better version.
Doppler began enjoying widespread respect as a
scientist and lecturer.
16
In 1850 when Christian Doppler was 47, a new
Institute of Physics was created at the
University of Vienna and Doppler was appointed
the institutes first director.
He began lecturing and presenting his theories on
light and sound waves.
However, his health continued to deteriorate, and
he began experiencing severe chest pains.
17
In 1852, Doppler traveled to warmer climates in
Venice, hoping for some improvement in health.
In 1853, realizing the end was near, his wife
journeyed to Venice to be with him when he died
at the age of 50.
18
Bibliography
Columbia Electronic Encyclopedia. (2000). 6th
Edition. Available. Online. http//www.encycl
opedia.com/searchpool.asp?target_at_DOCTITLE20Doppl
er 20effect, Columbia University Press
OConnor, J. J. and E. F. Robertson. (April
1998). Available. Online. www-history.mcs.st-
andrews.ac.uk/history/Mathematicians/Doppler.html