Mar 22, 2020
Thanks for helping me understand the Special Theory of Relativity, covered a lot of ground but repeated it so it really could sink in. Like your style and want to thank you for your assistance. Thanks
Jun 23, 2017
This course is very comprehensive and well prepared material for understanding the Special Theory of Relativity. Larry (the instructor) is very expert and has broad knowledge in explaining the course.
by Danilo C•
Jul 09, 2020
by SHAMPRANESH D•
Nov 10, 2018
by Abhijeet G•
Oct 31, 2016
by Kell B•
May 11, 2018
by Mustafa S•
Jul 15, 2017
by Roger D•
May 21, 2020
I’ve enjoyed this course, which I’ve been following during the UK’s Covid 19 lockdown. It’s kept me happily occupied and, thanks to Larry Lagestrom’s generally careful and enthusiastic exposition, I’ve finally got my head round the relativity of simultaneity and its role in explaining the ‘pole in the barn’ paradox - something I never quite managed when introduced to special relativity as a physic’s undergraduate more than 50 years ago. So, a big thank you to Prof Lagerstrom.
I’ve a few reservations. First, the treatment of Einstein’s second postulate seems to be needlessly confusing. Starting in week 3, and then repeatedly throughout the course, the lecturer maintains that, by the phrase ‘the constancy of light’, used to describe the second postulate, Einstein means that light is a wave, implying, drawing an analogy with, say, sound waves, the the existence of a ‘supporting’ transmission medium - the luminiferous ether. It’s then maintained that, somehow - I can’t follow the argument - Einstein combined this interpretation of the constancy of light with the principle of relativity to deduce that the velocity of light is constant for all observers. I’ve read the relevant bit of Einstein’s 1905 paper several times, and I just don’t think this is what Einstein is saying at all. What it actually says is: ‘Llght is always propagated through empty space with a definite velocity c, which is independent of the motion of the observer’. There’s no recourse to any sort of argument, instead, it’s simply stated as a fact - just what you’d expect for a postulate. From some of the posts in the discussion forum, it would appear I’m not the only one having difficulties with this issue.
My second reservation - following on from the first - is that there’s too much time and effort devoted to the Michelson-Morley experiment. There’s no ether, the experiment was doomed to failure and all that time and effort deriving expressions for possible phase shifts - using highly questionable assumptions about the speed of the local ‘ether wind’ - could have been better spent.
It’s a small point, but my last reservation is with the derivation of length contraction, which I found hard to follow. The alternative approach - using a light clock sending pulses longitudinally along a train - seems much more straightforward and follows on nicely from the transverse clock used to explain time dilation.
Where I think the course really scores is in the derivation of the Lorentz transforms and the use of space-time diagrams. If you can work your way past possible early confusions and press on to these key topics,; you'll be amply rewarded for your troubles.
Alongside the course I’ve read Larry Lagestrom’s book, ‘Young Einstein: From the Doxel Affair to the Miracle Year’. It’s a good read and is particularly good at explaining the content of all Einstein’s 1905 papers.
by John R•
Sep 16, 2017
Excellent presentation, clearly explained in generic language some of the esoteric concepts of the Special Theory of Relativity. In my Physics IV class, fifty years ago, we called this "Science Fiction I." I enjoyed the course. Only downside, I would think that a University with the standing of Stanford would produce a presentation that would use digital graphics instead of a white board and dry erase marker. With the capabilities of computer programming, this course could be greatly enhanced in the audio/visual area.
by Bhushan J•
Aug 09, 2017
In my view the course was a great exposure to Special Theory of Relativity and superbly conducted by Prof. Lagerstrom. I think some more rigor could be brought into as 'optional modules' and in the optional problem sets. There are some places where explanation could be elaborated or made clearer further in my view. Nonetheless for anyone who wants to know something about Special Theory (and vet intellectual appetite further), I would recommend this is a good place to start. Thank you!
by Prasad S•
Jul 13, 2018
At first, it really seems to be very slow paced, but latter you realize that those initial concepts were so key to the analysis and concepts in during latter lectures. The professor seemed to be very dedicated, and taught everything from the ground-up; which was really a help and thus, there does not arises a moment when you seriously struggle about the topic being discussed. HATS OFF to the professor for teaching in such a simplistic and conceivable fashion.
by Lior S•
Jan 17, 2017
This was a great course which is taught by a passionate and patient lecturer. The whole 8 weeks covers the first half of Einstein's famous paper in detail. The pace can be slow, but of course you can always speed up the videos. The mathematics is very approachable - school level algebra is all you need. The only other prerequisite is a basic understanding of light and electromagnetic waves.
by Floris v d P•
Dec 09, 2016
A comprehensive introduction to the subject, somewhat spoiled by the unrelenting reiteration of the most basics concepts in the earlier parts of the course. A bit of a pity, since the lecturer is a fairly engaging speaker when he is not busy interrupting the flow of his argument with mind–numbing repetition.
by Deleted A•
Dec 18, 2017
The content is really good. The quality of the content is excellent. The instructor's pedagogical skills are excellent as well.
The only criticism I have is with the length of the videos. I feel they could be shortened. Other than that, one of the best introductory courses for Special Relativity.
by Mahesh U•
Feb 21, 2017
Not much of mathematical inclination. But the Prof. is really of high standard and he makes sure that you understand everything by the end of any topic as he will run by each topic more than once. Its an introductory course but induces a great amount of interest to learn more!
by Anthony B•
Mar 24, 2017
Very good introductory course, clear and well designed, with a nice emphasis on the key concepts of the special theory of relativity. The mathematical background required is very light, hence the quantitative analysis of various examples and situations is limited.
by Felix M•
Apr 25, 2020
A brilliant course. I got everything I wanted to out of it by the end, but one thing I would say is that it started off a little slow, particularly in weeks 2 and 3. All things considered, a great way to build a better understanding of special relativity.
by Ahmad S M•
May 07, 2020
one of the best courses that I have taken so far from Coursera (and I took a lot). Easy, step by step mathematically, engaging in particular in discussion forums, Definitely recommended to anyone who has the least interest in theoretical physics!
by Ilan M•
Sep 24, 2017
The course gives you a good qualitative understantding of special relativity as well as the historical context in which Einstein came up with the theory. The course is easy to engage with, even if you don't have much physics knowledge.
by Frantisek B•
Sep 12, 2019
Love the course as its a interesting insight into the world of physics.
What i dont think was effective was the multiple choice quizzes as you could just glide through them without applying the knowledge you learned in any new way.
by Zach J•
Nov 29, 2016
Very in Depth for if it is your first time learning. If you have already read about General and Special Relativity it doesn't tell you very much more than what you already know. Either way it is a great course.
by Alexander S•
Mar 26, 2017
I disliked really slow speed of formulas derivation, simple operations like cancelling out terms are done in multiple steps. Like for children that only starting study mathematics. Otherwise great course!
by Tiffany O M B - R•
May 02, 2017
Than You so much this course has really influenced my life at such great heights
It has also made me give more recognition to our Bible Family for all their great accomplishments.
by Aidan K•
Feb 27, 2020
Quite hard work - the topic is not intuitive, and the questions teem with the possibility of going wrong - badly wrong.
Effort is required, and is paid-back.
by Ritvik A•
Nov 23, 2017
It's a good course to start understanding Relativistic Physics. Nothing rigorous though.
The lectures are amazingly easy to understand. Overall liked it.
by luis a g s•
Oct 12, 2017
I think a chapter on momentum and energy conservation would be interesting, I liked the examples and the treatment of the paradoxes, very good course.
by chiu t h•
Jul 21, 2018
a very thorough introduction to special relativity, as a layman, I have gained immense insight & basic understanding. Thanks prof Lagerstrom!!!!