When the wave fronts of the sound waves are pushed closer together, the wavelength that a stationary person will hear will be smaller. The sound waves in front of the train begin to bunch up and are pushed together. As the train sets off, we begin to see things change. But what is the reason for this? Let's take the example of trains and look at this in more detail to explore the physics of the Doppler shift. Let's listen to the sound of a passing train to compare the effect from a different source. But as it passes by, it seems to drop in pitch. As the ambulance moves towards us, you hear the siren at one pitch. But what happens to the siren as an ambulance drives by? Well, if you listen closely, you can hear that the pitch of the siren changes over time. When this happens, what do you hear? Well, yes, you hear a siren. I'm sure many of you have been present as emergency vehicles or a train pass by. But what does this mean? Well, if we switch back to sound waves for a moment, we can use a real world analogy to explore this. In a paper entitled On the Colored Light of Binary Stars and Some Other Stars of the Heavens, Doppler presented his theory that observed frequency of wave depends on both the emitted light and on the relative speed of the source and the observer. Next stop on our tour of the properties of light and sometimes sound, is an effect first explained by an Austrian mathematician and physicist, Christian Doppler in 1842. Summarize the puzzles facing black hole researchers in modern science.Identify different ways of detecting black holes, and appropriate technologies associated with each detection method.Characterize formation theories associated with each type of black hole.Differentiate types of black holes and classify each type as observed or theoretical.Recognize different types of stars and distinguish which stars can potentially become black holes.Describe the application of fundamental physical concepts including gravity, special and general relativity, and quantum mechanics to reported scientific observations.Compare black holes in popular culture to modern physics to distinguish science fact from science fiction.Explain recent black hole research using plain language and appropriate analogies.
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