#2,236 in Science & math books
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Reddit mentions of Special Relativity (Mit Introductory Physics Series)
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Reddit mentions: 1
We found 1 Reddit mentions of Special Relativity (Mit Introductory Physics Series). Here are the top ones.
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| Release date | July 2017 |
> Why is a photon massless and still has momentum?
Because momentum isn’t actually p = mv, as in Newtonian mechanics, but it’s really
p = ( E/c^2 ) v
For objects with a non-zero mass m, moving non-relativistically, E is approximately equal to mc^2 and then p is approximately equal to mv, the Newtonian value.
However, photons are intrinsically relativistic. They have energy even though they don’t have mass (their energy is proportional to their frequency, E = hf, where h is Planck’s constant) and, so, they also carry momentum. In fact, since their speed (in vacuum) is always c, the magnitude of their momentum, using the above results, is always p = E/c = h f/c = h/wavelength.
> Why can't anything go beyond the speed of light? (Cliché but I never really understood why despite of many videos floating on YouTube)
Please take a read at this post I wrote here some time ago, where I address that question. Please ignore the first two paragraphs as those were part of a rant.
> How does a magnetic field originate?
A magnetic field is created by electric charges in motion. Since, however, motion is relative (you’re not moving with respect to your chair but you are moving with respect to, say, the Sun), so is a magnetic field. In a reference frame where an electric charge is at rest, you’ll only measure the electric field generated by the charge. In a reference frame where the charge is in motion, you’ll observe both an electric field and a magnetic field.
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Excellent introductory books on special relativity, in my opinion, are (in increasing order of difficulty):
Special Relativity: For the Enthusiastic Beginner
https://www.amazon.co.uk/dp/1542323517/
Special Relativity (Mit Introductory Physics Series)
https://www.amazon.co.uk/dp/B079SB3MWS/
and
Spacetime Physics: Introduction to Special Relativity
https://www.amazon.co.uk/dp/0716723271/
Einstein’s own books are pretty great too, and are now in the public domain. Search the Gutenberg project for them.