1,516 reputation
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bio website marty-green.blogspot.com
location Canada
age
visits member for 4 years, 4 months
seen 3 hours ago

Nov
14
comment What objective criteria distinguish between valid science, fringe science and pseudoscience in physics?
Not believe in Jim Carr? You might as well not believe in Archimedes Plutonium! (I don't know who wrote the poem from which this line is an excerpt but if you google it you will end up on my blogsite.) Seriously though, amazing article. Loved the stuff about evolution.
Nov
14
comment Desperately Need Help with Grade 9 Static Electricity
But then this doesn't explain why the air doesn't just "ground" the whole PVC pipe. Still, this isn't the first experiment I've tried with static electricity where I seem to get positive charge showing up out of nowhere. I also tried the classic electrophorous, rubbing the styrofoam and putting down the metal plate (powder paint coated!): when I picked up the pie plate (by an insulator), the metal plate was full of positive charge! (It's supposed to be neutral until you ground it. But I didn't ground it.)
Nov
14
accepted Desperately Need Help with Grade 9 Static Electricity
Nov
14
comment Desperately Need Help with Grade 9 Static Electricity
Ron, I'm going to have to give you credit for the correct explanation. It's not that there is a path to ground: I put a new hole in the PVC that just goes to dead air inside the pipe, and the effect is just as strong. When I bring a ground wire near my pipe, it works just like the screw: the crazy dancing around the wire and everything. It works the same if I ground the screw but I don't have to ground it. What I think is that when it comes to positive charge, the air is almost as good as a ground. I think the air has enough surplus positive charges that it effectively grounds the screw.
Nov
13
comment Desperately Need Help with Grade 9 Static Electricity
I'm under a lot of pressure to stick with option 1. But I can't do that. (I didn't mention that I'm a student teacher (I went back for certification at age 55) and it's my first unit on my own.)
Nov
13
comment Desperately Need Help with Grade 9 Static Electricity
Thanks, JB. I don't want to seem ungrateful, but it's AWFULLY strong to be just polarization. And I don't know of any kind of polarization where both ends of the screw have the same charge. I'm pretty sure the whole screw is positive. And yes, I checked the inside of the pipe and if there are charges on it, they don't create any forces. By the way, you previously had an upvote on your answer which is now missing; I just want you to know that it wasn't me who cancelled it.
Nov
13
comment Desperately Need Help with Grade 9 Static Electricity
Thanks, JxB, but I can't accept your answer for two reasons. First, I've seen attraction by induced charge and it's not as strong as direct attraction. This is a really strong force. And when it bounces away, it's also super strong, which is really not characteristic of induced charge. Finally, I just tried the pointy end of the screw inside the PVC pipe. Also positive. So the whole screw has the same charge.
Nov
13
asked Desperately Need Help with Grade 9 Static Electricity
Nov
12
comment Speed Distribution of The Particles
@kso83o I apologize for the ignorance of other people on this site. They should be ashamed of themselves.
Nov
9
comment Photon wave packets from distant stars
Additional for the record: Georg had a series of comments where he ridiculed my explanation, but he has erased them all now.
Nov
9
answered Quality factor for a quantum oscillator?
Nov
8
comment When is the force null between parallel conducting wires?
Thanks for the plug, Georg. The actual blog article can be found at marty-green.blogspot.com/2011/11/… or just google "marty green physics blog"
Nov
8
comment Photon wave packets from distant stars
For the record, I see that I have two comments in a row which are both identical. Just to explain how this happened: Georg said it was "silly" to think that silver bromide was converted to silver by light. So I asked: what then is the role of light in the process? Georg gave some kind of answer which didn't address my question, so I repeated the question. Then Georg came back and erased his previous answer, leaving my two questions just sitting there.
Nov
8
comment Photon wave packets from distant stars
Okay. So what exactly is the role of light in the photographic process if not the reduction of silver bromide?
Nov
8
comment Photon wave packets from distant stars
Okay. So what exactly is the role of light in the photographic process if not the reduction of silver bromide?
Nov
8
comment Photon wave packets from distant stars
I don't know what the business about dyes has to do with my "Theory". I only claimed to analyze the thermodynamics of the silver bromide=> metallic silver conversion. You call my analysis "amateurish": are you saying it's wrong?
Nov
7
answered Photon wave packets from distant stars
Nov
6
comment Proofs that every professional physicist should know
Yes, that's right. You can actually get a pretty good ballpark of this lambda-squared dependency by working off my diagram. But even without the mathematics, the diagram shows that the available power depends only on the wave-on-wave interaction, not the size of the receiver. That's why I'm appalled when I read authorities like Scully debunking the wave theory of light on the basis of the physical cross-section of an atom.
Nov
6
comment Proofs that every professional physicist should know
Did you read my article which Helder referenced? The photoelectric effect is classically impossible only if you insist on using a tiny charged ping-pong ball as your model of the electron. If you use a proper quantum model of the electron, namely Schroedinger's equation, then Maxwell's equations are sufficient to complete the picture. If the photoelectric effect is classically impossible, then the crystal radio is also classically impossible.
Nov
6
comment Proofs that every professional physicist should know
Thanks, Helder. I'm not used to people agreeing with me.