Physics Questions, Problems & Solutions : TransWikia.com ~ Page 15

Behaviour of clocks and measuring rods on a rotating frame of reference

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 answer

Decoupling theory by diagonalising the Hamiltonian

I 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 answer

How can you prove that the squares of the expected values of the three components of spin sum to 1?

I 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 answer

Pressure Sensor in an Experiment

I 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 answer

Confusion concerning transition wavenumbers

I 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 answer

Transition $2p rightarrow 1s$ of Hydrogen Atom

I 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 answer

Definition of current density

In 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 answer

How to calculate radius of the $n$th Bohr orbit if the nucleus is not at rest relative to the center of mass?

I'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 answer

My calculation of the radius of the visible universe: where am I going wrong?

I 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 answer

How is quantum tunneling possible?

How 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

6 answer

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