By Lev Okun
Translated from Russian via Vitaly Kisin
This little booklet concentrates at the foundations of recent physics (its "ABC's") and its so much primary constants: c the speed of sunshine and ħ— the quantum of motion.
firstly, the ebook is addressed to specialist physicists, yet so that it will in attaining maximal focus and readability it makes use of the best (high tuition) arithmetic. for that reason many pages of the ebook might be beneficial to school scholars and will attract a extra basic viewers.
Readership: students and readers within the actual sciences.
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Extra resources for ABC of Physics : A Very Brief Guide
For a free particle m2 = E 2 c−4 − p2 c−2 . 9 Rest energy If a free particle is at rest, the rest energy of the particle is given by E(p = 0) ≡ E0 = mc2 . 8) imply an approximate equality p ≈ mv, which in Newtonian physics takes the form p = mv. 10 Massless photon Astronomical observations tell us that the photon mass is very small: mγ < 10−51 g. Therefore physicists assume that the mass of the photon is zero. 9) implies that its velocity is always c. Free photons cannot be at rest, they always move at the speed of light.
16) Further discussion of S would stretch beyond the confines of this small book. A beautiful explanation of the physical meaning of the least action principle see in Feynman Lectures . 1 Units: experiment and theory Talking about units here may seem out of place but it is necessary because physics is a science not only theoretical but also — and first of all — experimental: theory organizes facts that were established experimentally. 054 571 628(53) · 10−34 J·s where 1 J stands for one joule and 1 s is one second; here and further down the digits in parentheses ((53) in this case) give the experimental uncertainty in the last significant digits.
10 Massless photon Astronomical observations tell us that the photon mass is very small: mγ < 10−51 g. Therefore physicists assume that the mass of the photon is zero. 9) implies that its velocity is always c. Free photons cannot be at rest, they always move at the speed of light. e. 10−8 and equals approximately 9 · 10−28g. 7 · 10−24 g. 1 The spin and orbital rotation∗ Two types of particle rotation are known: spin and orbital. A particle possesses the spin (the intrinsic rotation) regardless of how it moves through space.
ABC of Physics : A Very Brief Guide by Lev Okun
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