# All Questions

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### Response curve shape transformations with different units photon energy and photon count

I have response efficiency curve (for an optical component) as a funtion of wavelength. The values are dimensionless numbers between 0 and 1. The curve I have now, say f1(lambda), refers to the ...
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### Why does my hands' hairs get clinged to my cathode-ray TV?

My dad's old TV! When I switch it off after watching and get my hands closer, my hands' har get attached to the screen. And it sticks for sometimes! Now, I know how a cathode ray oscilloscope works. ...
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### Why are Rainbows always seen Horizontally or from Sideways?

We see Rainbows many times, but we always see them Horizontally or from Sideways. Why can't we see it from under it?/From the point where it starts or ends(end points)?
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### Wave Equation Variables and Interpretation

Consider the scalar wave function $\exp[i(kr -\omega t)]$, where $k$ is the wave number and $r$ is the spatial coordinate. We can alternately define $k$ to be a vector that gives the direction and ...
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### Maximum velocity in a viscous fluid

Situation: A viscous fluid is flowing through a tube, and the rate of ejection is x $m^3s^{-1}$ Finding the velocity of the ejected fluid would be simple enough, by dividing the rate of ejection by ...
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### How to know if a wave function is physically acceptable solution of a Schrödinger equation?

How does one decide whether a wave function is a physically acceptable solution of the Schrödinger equation? For example: $\tan x$ , $\sin x$, $1/x$, and so on.
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### Symmetry Group of system to a given Hamiltonian

I want to determine the symmetry group of the following system: I consider a charged particle in a spherically symmetric potential $V$ and a homogeneous electric field of magnitude $E$ in ...
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### How did Planck use the concept of statistical entropy in trying to understand the physical meaning of his own law?

I was reading Introducing Quantum Theory: A graphic guide (by J.P.McEvoy & Oscar Zarate) and came across Planck's predicament of understanding his very own law that accurately explained the ...
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### Induced current created by a magnet falling in a copper tube?

One of the educational demos often shown in schools is to drop a high strength neodymium magnet down a length of copper tube. It takes a considerable time to exit the tube because as it falls it ...
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