<p>Alright well I'm sitting here drinking my latte from dunkin donuts and I got this crazy idea to do this thread. Idk considering there are many physics hopefuls on this thread and some are unsure of what topics may or may not be on it.</p>
<p>so the purpose of this thread is to note any problems of particular interest or topics you are unsure will be on the test.</p>
<p>If someone has an answer to a question, please answer it in two posts....try not to drag out a convo or argue over one problem. </p>
<p>I'm in the same boat...I think we will be fine as long as we know all the topics in KAPLAN and PRINCETON. anyone make any study guides or antything?</p>
<p>alright I have a problem here i don't get it.</p>
<p>a light ray strikes a photovoltaic metal</p>
<p>which is true of this scenario if a voltage is introduced into the metal by the light ray </p>
<ol>
<li>light ray is a blue light</li>
<li>beam is below threshold (side note: can anyone explain teh significane of threshold)</li>
<li>beam does not contain any photons</li>
</ol>
<p>answer could be a combination of the above, but it cannot be none of the above.</p>
<p>I say the answer is #1. Can anybody confirm?</p>
<p>A threshold is the energy required to "dig out" an electron. You need extra kinetic energy above the threshold to get the electron in motion. #1 seems like the most reasonable answer.</p>
<p>b/c for the voltage to occur, there must be moving electrons taken from the metal. This is only possible if the energy is above the threshold and since light is being used, there must be photons (since photon is a quantum of light). Choice #1 seems most reasonable here.</p>
<p>I'm taking it in oct too....still not too sure about magnestism... in my opinion it's the most dreadful of all chapters physics has! does anyone agree with me?</p>
<p>hi everyone. i hope i can be of help here, coz i like physics. one tip though guys; rely ONLY on PR and kaplan. other comapnies' books are not refelctive on the actual test.</p>
<p>laskmi, i agree the magnetism is the worst topics of all, but only one or two subtopics within it.</p>
<p>:)) so I see everyone here is cheering me up! thanks you guys! well, hopefully I'll do just as well as you did. still, in school those formulas weren't the only ones I needed and that's why I still don't like magnetism :)</p>
<p>Hi !
I have a question. Do you by heart formulas, learn to derive them, or both? I know how to derive them but I am afraid I will be losing too much time at the test. Any advice?</p>
<p>well...most of the formulas you need for the sat aren't that complicated as to not be able to memorize them. it's very good you know to derive them, but you might loose some precious time. still' I think with good practice you'll be able to memorize them with less effort ;)</p>
<p>derivation is only for school exams, where by deriving you don't need to waste your memory (if that was possilbe) memorizing stuffs that you can derive on the spot. But for SAT, memorizing is better, since that'll save you plenty of time. Most are easy ones that will come naturally as you practive more.</p>