The Official AP Physics B Thread

Test Preparation AP Test Preparation
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<p>Quantum transitions that result in the characteristic sharp
lines of the X-ray spectrum always involve
(A) the inner electron shells
(B) electron energy levels that have the same principal
quantum number
(C) emission of beta particles from the nucleus
(D) neutrons within the nucleus
(E) protons within the nucleus</p>

<p>Which of the following experiments provided evidence
that electrons exhibit wave properties?
I. Millikan oil-drop experiment
II. Davisson-Germer electron-diffraction experiment
III. J. J. Thomson’s measurement of the chargeto-
mass ratio of electrons
(A) I only
(B) II only
(C) I and III only
(D) II and III only
(E) I, II, and III</p>

<p>Quantities that are conserved in all nuclear reactions
include which of the following?
I. Electric charge
II. Number of nuclei
III. Number of protons
(A) I only
(B) II only
(C) I and III only
(D) II and III only
(E) I, II, and III</p>

<p>Which of the following imposes a limit on the number of
electrons in an energy state of an atom?
(A) The Heisenberg uncertainty principle
(B) The Pauli exclusion principle
(C) The Bohr model of the hydrogen atom
(D) The theory of relativity
(E) The law of conservation of energy</p>

222

<p>Thanks zoaxanthellae, that was very helpful =) (for the equation sheet)</p>

223

<p>true, but my point is that there is no such thing as maximum total energy, total energy remains constant</p>

224

<p>Databox are those AP test problems? 'Cause if they are…</p>

<p>[****]</p>

<p>Oh, and I see what you’re saying. Dumb oversight on my part.</p>

225

<p>No problem, and yes, those are all from a released AP exam.</p>

226

<p>@ DataBox:</p>

<p>?, B, A, A.</p>

227

<p>CBAA?? For DataBox’s questions.</p>

<p>EDIT: Wait I meant CBAB - I was going for Pauli’s exclusion</p>

228

<p>A</p>

<p>no idea (possibly B)</p>

<p>A</p>

<p>A (?)</p>

229

<p>I thought Heisenberg uncertainty principle was that you couldn’t pinpoint multiple things about an electron or something along those lines.</p>

230

<p>Heisenberg’s unc. prin. is about not knowing both position and velocity of an object at the same time.</p>

231

<p>i am soo not ready for this…and i only have like 4 hours left…:(</p>

232

<p>No one has got it yet, Aero, Anjoola, and shs all have two correct answers (not accounting for answers that they were uncertain about)</p>

<p>Yeah, these questions are not nice…</p>

233

<p>Are they all from the same test? I’m seriously considering just leaving my Nuclear knowledge at the basics, i.e. what beta decay is, etc. I know none of the principles.</p>

<p>I figure if I can do well on the other 85% of the test I’ll be in good shape for a 5 >_></p>

234

<p>a
b
a
?</p>

<p>1-char</p>

235

<p>Yes, they are all from the same test, and jpl you have three of them down =)</p>

236

<p>thats it everyone get on the chatroom</p>

<p>[Chatzy</a> - AP Physics B](<a href=“http://www.chatzy.com/861192448397]Chatzy”>http://www.chatzy.com/861192448397)</p>

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<p>for the last one i guess b</p>

<p>because it might be a pattern</p>

<p>ab ab :O</p>

238

<p>A b a b? :-/</p>

239

<p>I think the last one is B? A, C, and D don’t seem like they have anything to do with it.</p>

240

<p>a
b
a
c</p>

<p>10char</p>