Click on the buttons to make the Observer, the Source or Both approach, and observe the waves on the graph. This Interactive shows you what the Doppler Effect is: how the frequency and wavelength of light or sound waves change as the source or the observer (or both) move relative to each other. What happens to the velocities? Why? This Interactive will help you figure it out.Īstronomers use the Doppler Effect to determine the motion and speed of galaxies and other distant objects. Then increase the dark matter in steps, plotting the star velocities on the graph after each step. Set up a galaxy with no dark matter, and look at the speeds of the orbiting stars. But there’s even more mass there that you can’t see! This Interactive will help you understand how astronomers know that. Look at telescope pictures of the Milky Way, and you’ll see countless stars, representing enormous mass. What will you see when the stars are similar in mass versus when they are very different in mass? How does the distance between them come into play? How do mass and luminosity correlate? Check it out with the Binary Stars Interactive. This Interactive lets you custom - build a binary star, and then observe its light curve. Why are binary stars – especially eclipsing binary stars – so useful to astronomers? One reason is their light curves are loaded with information about the masses and sizes of the stars. If you are using Netscape go to to download a free version of 6.2.1. If you are running a Windows-based Operating System, try using Internet Explorer 6.0, which can be downloaded free at. To run the interactives you will need Microsoft Internet Explorer 5.5 or later or Netscape 6. You'll be able to jump between these Exercises and the Analysis Tools with just Themes, related Exercises, and Solutions to the exercises. The Bohr Model, Retrograde Motion, and the H-R Diagram by watching the effectĮach Interactive will include an Analysis Tool (interactive model),Ī Tutorial describing its function, Content describing its principle Parameters and gain a better understanding of topics such as Blackbody Radiation, Each Interactive will allow students to manipulate These Interactives offer a fresh and dynamic method McGraw-Hill is proud to bring you an assortment of outstanding Interactives Please change your browser preferences to enable javascript, and reload this page. You must have javascript enabled to view this website.
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