Common Misconceptions in Physics III

topsquark

Forum Staff
Apr 2008
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On the dance floor, baby!
Let's get a fresh start here. This is a place to discuss various subtleties in Physics that may be common or generally accepted but turn out to be wrong.

-Dan
 
Mar 2019
774
40
cosmos
wave function vs particle state

"...Most of Introductory level QM deals with Linear Algebra at its base concepts. Along with that concept comes "linear superposition," which means that we can simply add the wavefunctions as they move with respect to each other.

No, waves cannot be considered to be a sum of particle states."
.......................
This semi-tramp desn't know if his old QM texbook outdated.
It tells: ...use wave function to describe particle state.
If the "linear superposition" of wave functions does not mean "a sum of particle states", what is it?
If someone misconsider it's "a sum of paricles moving with different momentum values", that's misconcept.
 
Mar 2019
774
40
cosmos
Cpt

What's the symbol of "-t" mean in physics?
Can anyone in this cosmos go back in time to ask Einstein?
Don't talk that kind of thing to this semi-tramp, he is scared...
 

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Jun 2016
1,190
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England
Back in time for t

Time is a very difficult quantity to define precisely.

I get the impression that the seemingly simple "t" in certain equations
is actually somewhat different from the apparently identical "t" used in other equations.

This seems particularly apparent in the 4D Space-Time equations vs the Quantum Mechanics equations.
And these are again different from the "t" in Entropy...

I suppose that all these "t"s must be connected somehow,
but I am not aware of any articles exploring this avenue.

Until we have a clear idea of what +t is, we have little hope of defining -t.
 
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Mar 2019
774
40
cosmos
-t vs another cosmos

"...Until we have a clear idea of what +t is, we have little hope of defining -t. "
Yes, Woody.
I don't talk more here. Thank you.