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Jun
28
comment Are there old aged particles?
@Jack: You are absolutely right. -but my understanding was(and still is) that you DO understand the quote, but refused to believe.
Jun
28
comment Are there old aged particles?
@Izkata: That is the reason I am posting comments, and not an answer. Referring to a well renown book is perfectly valid.
Jun
28
comment Are there old aged particles?
@Peter Shor: There is no exceptions. Griffiths is writing about "elementary particles".
Jun
28
comment Are there old aged particles?
Change your view. Do not listen to me or other random internet posters. Listen to Griffiths. -his books is among the best introduction books ever written.
Jun
28
comment Are there old aged particles?
One need not argue that your view is wrong - it can be measured. You ARE wrong. The likelihood for a decay of a given particle is independent of how long you wait.
Jun
28
comment Are there old aged particles?
Griffiths is correct. Elementary particles has no age. No inner clock. They are all the same.
Jun
12
revised Is it possible to take a picture of a star?
added 84 characters in body
Jun
12
accepted Is it possible to take a picture of a star?
Jun
11
asked Is it possible to take a picture of a star?
May
6
comment Does the slinky base stay perfectly level during the initial free fall
@007: Thanks for the reference. Interesting to see some calculation, that I could not have done quickly myself. They are calculating an estimate for the characteristic time, not the forces involved.
May
6
comment Does the slinky base stay perfectly level during the initial free fall
No. The answer just states the obviously: 1. Center of mass is in free fall. 2. There is tension pulling up. I am asking if the balance is perfect.
May
6
asked Does the slinky base stay perfectly level during the initial free fall
Mar
2
comment Reference for phase diagrams of elements
@Qmechanic: You are correct - please close it.
Jan
17
awarded  Popular Question
Nov
27
awarded  Caucus
Nov
13
comment How wide does a wall of ice need to be to stay in place?
ρhg ~ 1000kg/m^3 * 200m * 10m/s^2 = 2000000kg/m/s^2 = 2MPa. So I think that it is safe to assume, that all of the ice will be in phase I. -but what is the minimum width of a 200 m wall?
Nov
10
revised How wide does a wall of ice need to be to stay in place?
Deleted a couple of non relevant questions.
Nov
10
accepted How do we recognize hardware used in accelerator physics
Nov
10
asked How wide does a wall of ice need to be to stay in place?
Oct
24
awarded  Yearling