why does a car battery spark

Your hypocrisy shows your character to be beyond pathetic.

You wouldn't know, I'll bet that NONE of the responders think they are feeding a troll.

You're full of shit. You got caught responding before you found out or was told by another retard.

No surprise there. Most all of your responses are pretty devoid of intelligence, so boredom is not a big leap further down.

Neither does anything else you do, retard boy.

You filter me because I call you a name, yet that is exactly what your retarded ass just spent this entire post doing. You really are pathetic, little brained little boy.

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Hmm 100 photons at say 2 eV each that's 3 X10 ^ -17 Joules. That number means nothing to me. We sell a sonoluminesence thing that's alot dimmer than a battery spark. I wonder how much energy it is???

George H.

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Thanks John, Sometimes when the conversation gets interesting I get afraid the 'fringe' will take over the thread. I'll try and remember to ask the designer of the sono how many photons there are per flash. We sell a PMT with it and he must have some numbers.

George H.

'bye.

I don't learn procedures, I write them.

I never get headaches, only the occasional aura, and they're sort of interesting.

Vapor only condenses on a part for a couple of seconds. The condensation dumps a lot of heat into the part (stick your finger into the vapor to see how much); once the part gets hot, the condensation stops and any trapped flux stay put. We boil the boards in the deflux agent to loosen any flux, then spray them hard with distilled solvent, probably a hundred time more solvent than could ever condense on the part.

Just like the manufacturer and his rep suggested.

Don't get headaches.

John

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Have you ever used a mill with a rotating table? (Great for making circular O-ring grooves.) When you stop spinning the table the whole thing starts to turn back in the other direction.... Weird.

George H.

My phosphenes don't look anything like scintillations. I have read that astronauts see scintillations from high-energy cosmic rays.

Phosphenes may be the equivalent of dithering an ADC to eliminate quantization errors and increase sub-LSB sensitivity.

John

A great book: "Voyage" by Sterling Hayden, the crusty old actor. It's a novel about a sailing ship going from New England to San Francisco with some passengers and a hold full of of coal. Damp coal.

John

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You mean that it gives off light if I were to fart loudly near it?

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The missile launch detecting PMT that looks backward off the rear edge of the wings of the F4 Phantom can detect a single photon event.

My HVPS is in most of them and it leaks less then three picoamps. All detection events have high confidence of being positive. Probably can see gunfire.

Note how you totally missed the character that was referenced.

I think you are just too damned dumb to grasp the depth of the wit in that one.

Also, that I do the same thing you do by choosing a different nym when I want to post a wise crack or joke or whatever the f*ck.

Get-eth thy selfish self-eth a clue-eth.

Don't you mean "LSD Flashback"? Hahahaha.

I understand them just fine.

No, I've never cared for hallucinogens of any sort. I prefer speedy type drugs, specifically coffee and chocolate.

Auras are purely visual events, sort of a grand light show. For most people, they signal the start of a migraine, but for some reason mine fade out in 10 minutes or so.

Mine look sort of like this

but more like a bright yellow throbbing rugby ball instead of the black central part, surrounded by the characteristic jagged sawtooth black border, which seems to be a common theme.

I get hallucinations sometimes too, only very early in the morning before I get up. I really enjoy them.

Brains are great toys.

John

OK, but please don't explain them to me.

John

it's got to be less by several orders of magnitude, too much background noise from bodily function for a start.

When you see me explaining them to you, you can ask me to stop. Until then, don't fabricate events.

I'm an electronics designer. It's my job to fabricate events.

John

I'd still want to see some numbers. Hearing is awfully sensitive. The real problem is external background: it's reasonable (but not trivial) to contrive a space that has essentially zero background photons, but a good anechoic chamber is very difficult to come by. In a good one, after a half hour or so, you start to hear the blood pumping through your neck, and your heart beating.

Vision is also far more directional than hearing, which again helps discriminate against background.

Anybody know the hearing threshold in terms of actual watts present at the eardrum?

John