Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »

Activity for dmckee‭

Type On... Excerpt Status Date
Edit Post #283616 Post edited:
over 2 years ago
Comment Post #283511 You have two distinct questions here. I've followed @Olin's lead in answering the electron-proton question, and suggest that the question text be edited to focus on that case alone.
(more)
over 2 years ago
Edit Post #283616 Post edited:
over 2 years ago
Edit Post #283616 Initial revision over 2 years ago
Answer A: What happens if an electron collides with a proton?
Answering from the point of view of a particle physicist. Meaning we consider an event where and electron and proton approach each other in an initially free condition (not already bound). Electron-Proton scattering Believe it or not, the whole story is >They can scatter elastically or inelas...
(more)
over 2 years ago
Comment Post #283293 @Istiak There is no need or expectation that you are in school to read a text, but publishing industry pressures drive most texts into those rough categories. The only exceptions that spring to mind are self published online (and so immune to industry pressures). But in order to recommend books to ma...
(more)
over 2 years ago
Edit Post #283429 Initial revision over 2 years ago
Answer A: Book suggestion category proposal
The experience we had on the physics site Somewhere Else may be instructive (I've already written a little about it on Software Meta). In short, against my wishes they were allowed but because there was a fairly strong and well enforced notion of what a "good" answer would look like it worked out muc...
(more)
over 2 years ago
Comment Post #283293 That said, authors don't write down every detail of every development: they expect readers to see some steps. How much they expect depends on the level of the text, the specified mathematical prerequisites, and the author's personality. Some texts are terse and expect a lot of the reader, others are ...
(more)
over 2 years ago
Comment Post #283293 What level are you interested in. In the US (at least) it is typical to talk about "introductory", "upper-division", and "graduate" level texts. Introductory texts represent the first year of college instruction in physics and survey mechanics, thermal physics, and E&M in brief (the mechanics section...
(more)
over 2 years ago
Comment Post #283046 While one can find an historical origin for the units in modern system they won’t be the original origin. Organized systems of units go back a long time. I’d guess they date back to roughly the origin of writing (because both relate to trade) with refinements piled on as necessary. We know a lot, for...
(more)
over 2 years ago
Comment Post #280916 It’s worth noting that there is no direct relationship between indexes of refraction (at the top of the post) and corrective diopters (at the end). The closest you come is the lens-makers formula which tells you how to take those two numbers and build a suitable lens.
(more)
about 3 years ago
Comment Post #280385 @celtschk "Natural units" is a broader term—it can refers to any scheme where you drop constants—and I was educated before "Planck units" had become popular. For instance I took general relativity from James Hartle (while he was developing his textbook on the subject) and he described the units he us...
(more)
about 3 years ago
Edit Post #280385 Post edited:
about 3 years ago
Edit Post #280385 Initial revision about 3 years ago
Answer A: Unusual way to write spacetime coordinates/metric: Is there any downside?
There is no problem with the approach you suggest: it's equivalent to deciding to use seconds and light-seconds as your units for space-time four vectors instead of light-meters and meters. (I actually prefer that when I want to connect to human scaled measurements.) But ... most professionals who...
(more)
about 3 years ago