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seen Sep 6 at 18:23

Just here to learn and share.


Sep
24
awarded  Autobiographer
Oct
23
awarded  Yearling
Jul
28
comment What is the logarithm of a kilometer? Is it a dimensionless number?
It is also worth noting that a trigonometric function ought to applied in the same way, i.e. to unitless numbers. Otherwise, it does not make physical sense.
Jul
28
comment Pendulum period of different masses
When you analyze $\tau = I\alpha$ for a pendulum undergoing small oscillations, you will find that the mass terms cancel on both sides and hence the period does not depend on mass of the pendulum.
Jul
28
comment GHz rate single photon counting
@dmckee I don't think subtraction will work well for NIR ones. At least the ones we used were not good enough at 860nm. We switched to PerkenElmer photon counting modules instead.
Jul
27
comment GHz rate single photon counting
Don't PMT's have serious dark current issues (unless cryogenically cooled)?
Jul
26
answered Can visible light be emitted from a non-thermal source?
Jul
26
comment Any physical example of an “explosive” differential equation $ y' = ky^2$?
A "drag" force that is used to approximate motion of a body in a fluid, (i.e $F=kv^2$) is the first example that comes to my mind.
Jul
26
answered Lasing in a 2-Level system?
Jul
26
answered Slowing down light in an opaque crystal for a whole minute
May
18
comment What is the optical power level of common fiber optics lasers?
To my limited knowledge, NL effects are a concern and manifest as pulse distortion (due to many competing effects). They are more pronounced when the pulse width is short (100ns perhaps?). This effectively puts a limit on useful bandwidth. I vaguely remember analysis using an eye-diagram to quantify the effect of distortion.
May
15
answered How can we detect X-rays?
May
15
comment Light Ray Reflection from concave mirror
Removed the ridiculous down-vote by adding a +1.
Mar
20
comment Couldn't we measure electrons with good enough technology?
In my understanding, a measurement necessarily involves an interaction, and thinking simplistically, electrons interact with other electrons by exchanging photons. In theory you could have a device 'tuned" to some other interaction, then perhaps you don't have to detect photons. By measure I presume you wish to measure position? The question is not very clear.
Jan
30
awarded  Revival
Jan
10
awarded  Critic
Jan
8
answered Calculating vertical velocity component of a particle with mass, given the hit point of parabolic motion
Jan
8
revised How to calculate uncertainties of a natural exponential function?
Changed unc to \delta T
Jan
8
suggested suggested edit on How to calculate uncertainties of a natural exponential function?
Jan
8
revised How to calculate uncertainties of a natural exponential function?
Minor LaTeX formatting added.