Recent content by sigoldberg1

Ans: Looks like both, depending for Cr2O3. See https://www.google.com/search?biw=1292&bih=695&tbm=isch&sa=1&ei=KzfOXK-7I8Xm_Qbbq5HQAw&q=cr2o3&oq=cr2o3&gs_l=img.3..0l10.27306.31418..34591...0.0..0.96.393.5...1...1..gws-wiz-img...35i39j0i67.EPzWGoCfhk4 .

The dipole field for a bar magnet decreases roughly as (1/r)^3, where d is the distance to the pole. See Wikipedia "dipoles" Field of a static magnetic dipole[edit] See also: Magnet § Two models for magnets: magnetic poles and atomic currents Magnitude[edit] The far-field strength, B, of a...

This is a physics forum. Why not show the questioner a little physics? For example, I vaguely recall that the magnetic field of a bar magnet (dipole) decreases roughly as 1/d^3 from the end (pole). Is that right? Corrections?

Oops, sorry, never mind the above. While true, I completely missed your circadian rhythm question. I do not know much about the enzymes involved in the mechanism of circadian rhythm but there are many known "kinetic isotope effects" involving enzymes in biology, some involving isotope...

It's pretty simple. The special thing about deuterium is that it does not absorb (thermal) neutrons (very much, compared to hydrogen), i.e. the thermal neutron absorption (also called capture) cross section for deuterium is 3E(-4) vs 2E(-1) for ordinary hydrogen H(1). So the only thing that...