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Physics : Recent Questions and Answers (Page 94)

Find answers to your questions about Physics or help others by answering their Physics questions.

Classical Wave theory and the photoelectric effect

I read that according to classical wave theory, light is viewed as a wave whose intensity is continuously variable. And for this reason, it is unable to explain the photoelectric...

Asked on 08/25/2021

2 answer

Radioactivity and half life

Does the process of decaying in radioactive elements occur every second?The equation consists of $rm e$, so it must mean that decay due to radiation must occur every...

Asked on 08/25/2021

7 answer

Problem in Derivation of Goldstein

In Goldstein, chapter three, third derivation, given as, Kepler's equation can be written as${rho} = esin({omega}t + {rho})$,Now I have to prove that the first approximation to...

Asked on 08/25/2021

2 answer

The $delta$ notation in Goldstein's Classical Mechanics on the calculus of variation

In Goldstein's classical mechanics (page 36) he introduces the basics of the calculus of variation and uses it to effectively the Euler-Lagrange equations. However, there is a step in which...

Asked on 08/25/2021

2 answer

Is this a correct way of finding magnetic field of a magnet created with Wasilewski's method?

$quad$ Wasilewski's method (Or the method that could be seen in Dr Stone episode 9) consists of piece of iron being struck by a lightning, which then magnetises it....

Asked on 08/25/2021

1 answer

Was the notion of observable really necessary before quantum physics?

I'm a mathematician who's been struggling with the search of connections between physics theories and $C^*$-algebras. The most known connection I found was that the observables in quantum mechanics...

Asked on 08/25/2021 by André Porto

0 answer

Rapid-fire projectile motion such that all particles land at the same time

A short-barrelled machine gun stands on horizontal ground. The gun fires bullets,from ground level, at speed $ u $ continuously for a period of one second, but does...

Asked on 08/25/2021 by Nick_2440

3 answer

Temperature change of water and the copper can

The question is:"0.38kg of a liquid at 12 degrees C is heated in a copper can weighing 0.9kg by an electrical heater of power 20W for 3 minutes. It reaches...

Asked on 08/25/2021

1 answer

Commutator of tetrad and Lorentz generators

While reading "Four lectures on Poincaré gauge field theory" (available at RG) the authors present a relationship between a tetrad $e^i_{;gamma}$ (with Latin...

Asked on 08/25/2021

0 answer

Where can I find a derivation of interplanar seperation of triclinic crystal structure?

The interplanar seperation for orthorhombic crystals is found in most books on introductory solid state physics (e.g. Kittel). I searched for interplanar seperation for other crystals(hexagonal,triclinic etc), and found a...

Asked on 08/25/2021

0 answer

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