Recent content by P.Bo

Yes but what I'm asking for, using Balmer as an example, if you put in enough energy to raise electrons to n=5, is there anything ratio or percentage change that the electron will drop directly to n=2 or go through a n=4 or 3 before dropping to 2. Basically, there are 4 visible colors with...

Ah ok, didn't even think about it from the Moon's perspective.

Something that bugged me when doing this lab. Standard little glass vials of gas, toss it in a 5kV potential make pretty color, look through diffraction grating see the individual wavelengths that are the finger prints of the element. My question however are all wavelengths equally...

Ok I know our moon is getting farther away due to gravity (tidal force indirect), basically giving it kinetic energy and exchanging that for orbital energy. If the moon was in retrograde orbit, i.e. Triton around Neptune, it would work the opposite way and pull the moon closer to the...

Am I reading this right, recession speed was faster 14 Gy ago and has slowed down? By a factor of about 2? I'm sorry, the most updated data hasn't filtered down to the masses (the ones who make textbooks) and they're still stating the universe's expansion is speeding up.

A little correction for Drakkith, not all stars go through the process, it needs sufficient mass to compress further. Otherwise the degenerate state of matter, whether it's helium, carbon or neutrons will prevent further collapse, and degenerate matter doesn't have pressure change with...

Just shooting from my hip here, but why wouldn't electrons and positrons go in the same direction? The magnetic fields will just make them swirl around in opposite rotating directions, but still in the same trajectory/path. As to your torodial black hole, I'm lost on that one. I would...

Something wrong with your math somewhere... perhaps a rounding error... as z approaches infinity, the distance d approached the Hubble length c/H0 which is roughly 13.8 Gly. So you should not get 14.24Gly for an answer FYI, has nothing to do with the "observable size" of the Universe.

There are two things that are really at work within a star, gravity trying to collapse it, and outward pressure which is preventing the collapse, this act of being held in balance is what is referred to as hydrostatic equilibrium. No more fuel to use, no more pressure, so it collapses on...

You absolutely can (and must) do that. Any acceleration on the system is going to be a result of the net force, not individual forces. The force is what causes the acceleration not the other way around. Besides you couldn't get multiple accelerations that sum up in a case like this since...

Pressure is simply a force that's applied over an area, in the sense you/we are talking about it is caused by gravity creating a force, weight, and that force applied over an area translates to pressure. If there was no gravity anywhere, there would be no force. However at the exact...

Yes but the 64 dollar question is will we ever receive photons from those bodies that are now receeding FTL. If so, then how would they be redshifted? If not, then why not... since again it's recession speed is relative to distance, and there is a reference frame were the recession...

There's no net force due to gravity at the center (assuming something with spherical symmetry), because the gravity is pulling on you in every direction. If you were at the center, the "stuff" on top of you would not be at the center, would have net gravity affecting it would still pull it...

Thanks for the reply, I did skim through the relevant parts of your post before I posted, one thing that was a bit confusing in one part you're saying H0 = 70 km/s/Mpc, then a line later you say H0 = 4300±400Mpc... which I'm assuming you mean d = 4300 Mpc ... and it simply was a typo in your...

Ok, I'm writing up something and I do something I always hate doing... I start arguing myself into a corner. The argument of the night is the expansion of the universe and how it applies to redshifts. Which has brought a series of questions which I can't seem to grasp right now. I) Is...