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Cheers, wanted to make sure it wasn't something similar to the photoelectric effect, like where the energy just has to be past a certain threshold value at which point all EMR above that is absorbed.

Sorry probably because I posted in the wrong area, should be in quanta to quarks

Its stated as assumed knowledge for my practical test

Can an atom only absorb a photon when the energy of the photo allows it to jump up the energy level. ie: if the incident photon has MORE energy than required, it will not be absorbed? Just curious cause the absorption spectra of hydrogen suggests that the photon must have the exact energy...

From my understanding, the exclusion principle does not explain the relative intensity of spectral lines, since the relative intensity is to do with some electron transitions being preferred over another. This is do with probability and I think somewhat relates to Heisenberg's uncertainty...

Is this the cssa paper eventually released to the public? Curious to see the difficulty of this years paper.

The exclusion principle explains what causes the limitations of the bohr model Eg: quantum number having to be different causes sub shells and hence fine line structure... or something to that effect

Does anyone know where I can find a comprehensive list of visual techniques and their effect. I only found out what vectors are today which has got me worried since I've realised that I've never properly been taught this stuff in school, oddly enough.

I thought the one where they cross is wrong? The spacing between the lines is used to show the strength of the field... field lines can't cross because that implies an infinite intensity at that spot which is of course impossible, right?

I had trouble with last Q's in 4u until this week, when I learnt binomial theorem (3u). Made some of those last questions much much simpler...

ha, much better than mine

isn't it just change in kinetic energy = change in gpe, and also doesnt work done = gpe? since W=Fs=mgh=Ep (subbing the gravity formula for g)

Where did you find a marking criteria for this? I thought they only exist for the most recent hsc papers... anyway Classical physics predicted that the radiation emitted by a black body should continuously increase in intensity as wavelength absorbed became shorter. While the mathematical...

isn't affected by an electric/magnetic field and conservation of atomic mass

If I am not mistaken, this is pappus's theom, where you do two shells at once, for each value of r. The left hand area has radius 1-x, and the right hand area had radius 1+x. The limits go from 0 to 1, as that takes care of both sides (as you said). You will most likely be stepped through the...

Re: MX2 2015 Integration Marathon http://integrals.wolfram.com/index.jsp?expr=%28x*%28sqrt%281-%28x-1%29%5E2%29&random=false ^ can anyone help with that? Not sure how to sure the latex thingy. that will show the equation in full, but doesn't include the upper limit of 2 and lower of 0...

So, the orbital velocity equation only applies when it is in a stable orbit? When the speed is first halved in the question, the orbit is no longer stable, equation no longer applies.. hence it undergoes orbital decay until the KE it gains from losing GPE puts it back into a stable orbit, at...

yes I know that much... but it goes against the orbital velocity equation which is why I started this thread...

Answer is D, why not A? If Velocity is the square root of (GM/r), if velocity is decreased, wouldn't radius have to increase? I know it would make no sense for it do so, but it seems to go against the formula...

What school? Could be mine by the sounds of it :eek: