Year: 2022

SO ENDS this first of two weekends featuring one aspect of how Nature does large-scale chemistry in aqueous solutions. Biochemists and chemists do these reactions at mg or Kg scales, but geologic processes involve trillions of tons of reactants on the scale of continents. When you survey a landscape remember that it is highly dynamic on geologic time scales. View in LinkedIn

MACRO REFLECT MICRO. “Most minerals occur naturally as crystals. Every crystal has an orderly, internal pattern of atoms, with a distinctive way of locking new atoms into that pattern to repeat it again and again. The shape of the resulting crystal -- such as a cube (like salt) or a six-sided form (like a snowflake)-mirrors the internal arrangement of the atoms.” https://www.geologypage.com/2016/03/how-do-crystals-form-grow.html View in LinkedIn

Round-leafed navel wort, pig’s ear, oblong pig’s ear, narrow pig’s ear, finger pig’s ear, purple pig’s ear; common wild plants have a variety of peculiar names, rooted in a rich history of local lore. View in LinkedIn

OUTER SHELL ELECTRONS. “As given by Compton, the explanation of the Compton shift is that in the target material, graphite, valence electrons are loosely bound in the atoms and behave like free electrons.” https://opentextbc.ca/universityphysicsv3openstax/chapter/the-compton-effect/#:~:text=The%20Compton%20effect%20is%20the,wavelength%20of%20the%20incident%20radiation View in LinkedIn

EXPLANANDS. “Compton assumed that the incident X-ray radiation is a stream of photons. An incoming photon in this stream collides with a valence electron in the graphite target. In the course of this collision, the incoming photon transfers some part of its energy and momentum to the target electron and leaves the scene as a scattered photon.” https://opentextbc.ca/universityphysicsv3openstax/chapter/the-compton-effect/#:~:text=The%20Compton%20effect%20is%20the,wavelength%20of%20the%20incident%20radiation View in LinkedIn

CONUNDRUM. “This model explains in qualitative terms why the scattered radiation has a longer wavelength than the incident radiation.” https://opentextbc.ca/universityphysicsv3openstax/chapter/the-compton-effect/#:~:text=The%20Compton%20effect%20is%20the,wavelength%20of%20the%20incident%20radiation View in LinkedIn

ENERGY-WAVELENGTH. “Put simply, a photon that has lost some of its energy emerges as a photon with a lower frequency, or equivalently, with a longer wavelength.” https://opentextbc.ca/universityphysicsv3openstax/chapter/the-compton-effect/#:~:text=The%20Compton%20effect%20is%20the,wavelength%20of%20the%20incident%20radiation View in LinkedIn

DERIVATION. “To show that his model was correct, Compton used it to derive the expression for the Compton shift. In his derivation, he assumed that both photon and electron are relativistic particles and that the collision obeys two commonsense principles: (1) the conservation of linear momentum and (2) the conservation of total relativistic energy.” https://opentextbc.ca/universityphysicsv3openstax/chapter/the-compton-effect/#:~:text=The%20Compton%20effect%20is%20the,wavelength%20of%20the%20incident%20radiation View in LinkedIn

PRESUMPTION. “Following Compton’s argument, we assume that the colliding photon and electron form an isolated system.” https://opentextbc.ca/universityphysicsv3openstax/chapter/the-compton-effect/#:~:text=The%20Compton%20effect%20is%20the,wavelength%20of%20the%20incident%20radiation View in LinkedIn

“The moment one gives close attention to any thing, even a blade of grass it becomes a mysterious, awesome, indescribably magnificent world in itself.” (Henry Miller). https://lnkd.in/eaUq7Jwy View in LinkedIn