Doppler Effect, Binary Stars, Neutron Stars and Black Holes

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Doppler effect is all about relative motion of source and sound. Watch a tuning fork of frequency 4000 Hz being taken back and forth at the speed of 1 m/s and you know what is Doppler effect. The rotational motion of an object and Doppler effect is also explained.A simple tube is rotated to show the resulting effect. Doppler effect for electromagnetic wave is the next topic where the difference between the two cases is clearly explained.The spectrum of Binary star along with Doppler shift is used for many studies related to stars e.g. calculation of period, velocity and even their masses.While explaining X-Ray binary we come across the fact that an object as light as 10 gms. when thrown towards a Neutron star can release energy equivalent to that of a huge atom bomb. White Dwarf, Chandrashekhar Limit and black holes are also explained. A black hole has mass but no size. We talk about something called event horizon around a black hole. An object which falls within the event horizon cannot escape the black hole.

Prof. Walter Lewin, 8.01 Physics I: Classical Mechanics, Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed June 13, 2011). License: Creative Commons BY-NC-SA: http://ocw.mit.edu/terms/#cc

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