Shop Windows to the Universe

The Spring 2011 issue of The Earth Scientist is focused on modernizing seismology education. Thanks to IRIS, you can download this issue for free as a pdf. Print copies are available in our online store.
Picture of Christian Doppler
The University of St. Andrews, Scotland

Christian Doppler

Christian Doppler was an Austrian mathematician who lived between 1803-1853. He is known for a principle he proposed in 1842. This is now known as the Doppler Effect. He thought that the pitch of a sound would be different if the source of the sound was moving.

Doppler's hypothesis was tested by Buys Ballot in 1845. He used two sets of trumpeters. One set was at a train station and one set was on an open train car. The train car was pulled past the station. Both groups of trumpeters played the same note but the notes didn't match. The frequency of the notes had changed.

Later, a scientist named Fizeau went further with Doppler's work and applied it to light, too. Doppler had only worked out his theory for sound.
Last modified January 22, 2009 by Julia Genyuk.

Shop Windows to the Universe Science Store!

Learn about Earth and space science, and have fun while doing it! The games section of our online store includes a climate change card game and the Traveling Nitrogen game!

Windows to the Universe Community

News

Opportunities

You might also be interested in:

Science, Evolution, and Creationism

How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more

The Doppler Effect

The Doppler effect was named after Christian Doppler, who first came up with the idea in 1842. He learned that sound waves would be pushed closer together if the source of the sound was moving toward you....more

Wave Beats

Sound travels in waves. When the waves hit your ear, you hear a sound. Have you ever noticed the waves in the ocean? They go up and down, up and down. Sound waves act the same way. The number of times...more

Charles Darwin

Charles Darwin was an English Naturalist who lived between 1809-1882. One of the most famous and influential scientists of all time, his ideas changed the ways all other scientists thought. Darwin started...more

Christian Doppler

Christian Doppler was an Austrian mathematician who lived between 1803-1853. He is known for a principle he proposed in 1842. This is now known as the Doppler Effect. He thought that the pitch of a sound...more

Ben Franklin

Ben Franklin was an American scientist and statesman who lived between 1706-1790. He studied electricity and learned of its dangers and possible uses. Franklin developed many inventions that made people's...more

Edmond Halley

Edmond Halley was an English astronomer who lived between 1656-1742. He reasoned that the same comet which he saw in 1682 had appeared before and predicted that it would appear again, about every 76 years....more

William Herschel

William Herschel was born in Germany. He moved to England and worked there most of his life. He lived between 1738-1822. He built powerful telescopes which let him observe the heavens with greater detail....more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA