Category: relativity theory
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Four-vectors and conservation laws in relativity
This lecture was delivered to the final year honors class of 3 year science degree students on 21 November 2017 as part of the Classical Dynamics paper. In this lecture we will discuss some of the important tools of relativistic mechanics. We will discuss the idea of proper-time, 4-velocity, 4-acceleration, 4-momentum, 4-force and related conservation…
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Relativistic Doppler effect
Relativistic Doppler effect. There is an apparent shift in the observed frequency of any electromagnetic wave (light) when there is any relative motion between the source of light and the observer. This can be easily determined by using the 4-vector formulation of theory of relativity. Lets discuss the details of this phenomena under two situations.…
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Introduction to special theory of relativity.
Special Theory of Relativity: Galilean Transformations,. Newtonian Relativity. This was a lecture delivered to physics-elective class of a 3 year non-physics degree students on 10th April 2017. This is also a good exposition to honors students and anyone at an introductory level of the special theory of relativity, with requisite mathematical background. Let us consider…
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A Photon has no mass. It can’t rest.
A) A Photon has no mass. B) A implies “It can’t rest”. C) Therefore it doesn’t have rest mass. D) Photon rest mass is zero. Assertion and reasoning; A is correct. B is correct and follows from A. C is correct, it does follow from B. But D is incorrect it does not follow from…
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How to add speeds; Galileo and Einstein won’t agree.
How to calculate the speed of anything, when their speed becomes closer to the speed-of-light. This article was originally a comment in the linked article; Why Nothing Moves Faster Than Light. — In order to correct the comment I have made earlier ” unless something is completely mass-less in its rest-frame ” I also add the following. This…
M Dash Foundation: C Cube Learning 