<p>oh ya I remember now - it was a constant. I havent heard about it before but I heard about a telescope - that's why I wrote so :) So "If we know the value of the Hubble Constant, can calculate size & age of Universe" - looks so easy now:)</p>
<p>how about a circuit? which switch shouldn't be used?</p>
<p>i chose the s3 switch because then the 2 ammeters would be connected with only wire and battery and 0 resistance which would result in a short circuit</p>
<p>Desbravo, I agree with all your answers in Post #44. I don't agree with your assessment of the A-levels, however. American universities do not consider an A on the A-levels as an A+. Nor do they do any such silly conversion system. Even if they did do this, what would they do with the A+? Put it on your first semester report card? Anyway, I can't vouch for the difficulty of the A-level exams (there used to be this site that posted past A-level exams, but I can't find it anymore). But, a British classmate of mine takes the IB diploma and claims that it is harder than the A-levels.</p>
<p>Also, if you could answer this one question of mine...does A-level physics touch calculus? I've been trying to find out, but I couldn't find anything.</p>
<p>Answers that I got for the SAT II Physics:</p>
<p>Proportions (in part A):
1) Work to change in KE: 1
2) Initial KE to Final KE: 1/4
3) Force forward to force backward: 1</p>
<p>Hubble constant: age of the universe
Only emit discrete wavelengths: energy levels are quantized
Perpetual motion: 1) the interval that was entirely inside the tube (think it was QR or something), 2) remove all energy loss
Photoelectric effect (E = hf - W): conservation of energy???
Electron moving parallel to magnetic field: undeflected
Magnetic field through loop w/ galvanometer: I (increase mag. field), II (decrease mag. field) are true, but not III (keep mag field constant)
Pinhole camera: real and inverted</p>
<p>Anyone remember some of the problems that were closer to the end? I only had time to check my answers to #60, and I would like some reassurance. :)</p>
<p>agree with everything</p>
<p>4 blank ( I knew the answer for the last problem, but my stupid mentor didn't let me to fill it in, because the time was over), damn it...might also miss a few questions in the middle, so i am expecting a 750+.</p>
<p>Conker: Are u sure photoelectric effect was conservation of energy?</p>
<p>crap, ya actually that does seem right, i think i missed that one</p>
<p>"Conker: Are u sure photoelectric effect was conservation of energy?"</p>
<p>No, that's why I put ???? after it.</p>
<p>I have no clue why it would be conservation of energy. But I knew it definitely wasn't E (Heisenberg uncertainty principle), since that's about knowing the velocity and position of a subatomic particle. Neither B (kinetic momentum) nor C (angular momentum) seemed right: the issue is energy, not mass or velocity. It might have been D (Mass-energy equivalence: E = mc^2), but I wasn't quite sure what that had to do with E = hf - W. Doesn't that deal more with mass being converted to energy, and vice versa, during nuclear reactions?</p>
<p>the clue is.. E o_0</p>
<p>A few more answers (some of these are quite easy, so forgive me):</p>
<p>Part A</p>
<p>(graphs)
1. Starts positive, constant negative slope.
2. Starts positive, constant positive slope.
3. Starts at (0,0), parabola</p>
<p>(a + and - charge were on a line, 5 points A-E were marked)
1. Electric potential is zero at point C (in between the two charges)
2. Electric force on proton directed towards right at point E (to the right of positive charge)</p>
<p>Part B
Force on particle was: F = mv^2/r
Beats are caused by interference.
Rod and disk: rod will fit in disk EXCEPT rod is heated
Thermal pollution cannot be eliminated
Capacitance would be increased by increasing the area only.
Calculating error: left blank, but in retrospect, I think it's 1.8
One circuit problem (I think V = 20 volts, and resistors 100 and 50 ohms in parallel): current was 0.6A</p>
<p>Any more?</p>
<p>Hello guys!
I retook the physics test yesterday from a 750 that I got in May. I found this test pretty simple and I think, have about 3 or 4 wrong. I agree with most of the answers in this thread.
What did u guys put for the question about the source emitting waves in a medium n1 which passes to medium n2 - I picked E where the waves became closer together.
And what did u put for the one that asked path difference for constructive interference for waves that were ofsetted by 180 degrees - I put lamda/2 but I guess the answer is lamda/4.
Conker - the circuit problem asked for the current in the 50 ohms loop which was 0.4A - total current in the circuit was 0.6A.</p>
<p>Yeah, desbravo is right... my school follows the british system and a B is an A- in america, an A is A+</p>
<p>Does anyone remember the other answer choices for the question with answer "Beats are caused by interference." ?</p>
<p>"One circuit problem (I think V = 20 volts, and resistors 100 and 50 ohms in parallel): current was 0.6A"</p>
<p>That was the current for the entire circuit. It asked for current at the 50 ohm resistor branch, which was .4A.</p>
<p>I think some people are wondering about the curve. Here is the curve from the "Real SAT IIs" book, so this was an actual curve on a test, which is probably close to what it is on most days (the lowest raw score for each scaled score is indicated):</p>
<p>63: 800
61: 790
59: 780
57: 770
55: 760
53: 750
52: 740
50: 730
48: 720
47: 710
45: 700</p>
<p>"That was the current for the entire circuit. It asked for current at the 50 ohm resistor branch, which was .4A."</p>
<p>Oops, you're right. I did put 0.4A. The part I was mostly asking about was the total resistance of 100/3, which looked a bit weird, to say the least.</p>
<p>"Does anyone remember the other answer choices for the question with answer "Beats are caused by interference." ?"</p>
<p>I remember some of the other choices were: resonance, refraction, polarization, and something else...</p>
<p>"Yeah, desbravo is right... my school follows the british system and a B is an A- in america, an A is A+"</p>
<p>You haven't explained what an "A+" is. Many American schools don't work by letter grades. Of the ones that do, some don't judge by + and -. And of the ones that do have +'s and -'s, some don't go up to an A+. And colleges almost certainly don't convert test scores to some arbitrary letter grade, especially when they don't do such a thing for AP scores.</p>
<p>Anyway, I've been told by British people in my school that IB is harder than A-levels, and IB is viewed as the equivalent of AP at American colleges. Therefore, I would assume that an A on A-level = 5 on AP, B = 4, C = 3, D = 2, F = 1.</p>
<p>conker,
maybe the otehr choice was diffraction</p>
<p>nope, beats are definitely caused by interference. Memories of my wave motion classes kind of drifted into my mind when I read that question...
btw what about the speed of the waves passing the boat? I can't remember whether I took the length of the boat as half the wavelength or one wavelenght...so what was it?
I chose s3 for the circuit question, what's the answer?
And perpetual motion, I think it was choice E
The time required to raise the temperature of water: definitely 100 s
I can't believe I used my left hand thumb instead of the right one for the electron flow-magnetic field question! Aaargh! I didn't leave any questions. How many can I get wrong for this test and still score 800?</p>