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I'm reading "Relativity: The Special and the General Theory" by Albert Einstein. In the following extract:Let us consider a space-time domain in which no gravitational field exists relative to a...
Asked on 12/10/2021
1 answerI have a Hamiltonian of the form $H = 2k(alpha alpha^* -beta beta^*) -2lambda (alphabeta^* + beta alpha^* )$ and I'd like to decouple the $alpha$'s and ...
Asked on 12/10/2021
1 answerI am working through Leonard Susskind's The Theoretical Minimum: Quantum Mechanics. In this book a statement called the "spin-polarization principle" is introduced, which essentially states that: For any state ...
Asked on 12/10/2021
2 answerI am running an experiment where I have a vacuum chamber attached to a vacuum pump and a pressure sensor: I use the pump to vary the pressure in the...
Asked on 12/10/2021
1 answerI have been trying to calculate the wavenumber for the 2p -> 5d transition in hydrogren. Using the formula: $ R_H (frac{1}{n^2_f}-frac{1}{n^2_i}) $ would give me a negative answer....
Asked on 12/10/2021
0 answerI am reading Mukhanov and Winitzki's book Introduction to Quantum Effects in Gravity and in second paragraph of Sec. 1.4.2 they say that : The spontaneous emission...
Asked on 12/10/2021
1 answerIn David Tong's lectures on Electromagnetism, the current density is defined as $vec J=qrho vec v$, where $rho$ is the density of particles with charge...
Asked on 12/10/2021
2 answerI've been dealing with a couple of questions regarding Bohr's model except where the mass of the nucleus is not negligible compared to the mass of the (revolving) electron. According...
Asked on 12/10/2021
1 answerI searched Physics Stack Exchange and google and could only find wordy articles on this, but what I am after is the actual mathematical calculation. I took General Relativity in...
Asked on 12/10/2021
1 answerHow is quantum tunneling possible? According to quantum mechanics, each particle is represented by a probability density function. This function must be continuous, and therefore when we look...
Asked on 12/08/2021
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