The Doppler Effect

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by jonnd13
Last updated 8 years ago


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The Doppler Effect

In meteorology, the Doppler Effect is used to predict future weather paterns. A stationary transmitter sends out signals, or waves, that bounce off of atmospheric objects like clouds and rain. If the waves that come back to the transmitter have higher frequencies, then the storms are moving toward the station. If the frequencies are lower, than they are moving away from the station. In astronomy, it is used to determine the distance between various astral objects. A wave of light is sent out into space and if the wave returns back to Earth at a higher frequency, than the object is moving towards the Earth and this is true respectively for a wave with a lower frequency. One example is when Edwin Hubble used this principle to determine the fact that the universe is still expanding. He was able to gather data showing that the galaxies are moving away from Earth, therefore expanding into the random nothingness out in space.

The Doppler Effect

Jon DowdingPeriod 7

The Doppler Effect is the overall change in frequency and pitch relative to the distance from the source of sound to the listener. The closer you are, the higher the frequency and pitch. The farther you are, the lower the frequency and pitch. This is because the closer you are, the faster the waves will travel back to reach you. The farther you are, the longer it takes for the waves to reach you.

What is it?!

One example of Doppler Radar in real life is with police officers. They are applying the same principles when they use their radar guns to determine the speed that someone's traveling at.

In everyday life, the Doppler Effect is experienced. The sounds coming from the car will vary depending on the positions of either observer.

This picture illustrates how Doppler Radar works when detecting the weather.


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