<p>yeah i think that’s the correct answer b/c so many people agree with it but what if there were less protons in the atom due to radiation? then the number of electrons doesnt have to be equal to the atomic number in order to make the atom neutral</p>
<p>The the scenario in the question does not state that there will be radiation. So on could probably assume that it is talking about the atom in a normal state. And even if there is radiation and the number of protons is less than the electrons, it would not balance and make the atom neutral. Hence, you have to have the same number of protons and electrons so that the atom can be neutral.</p>
<p>Did anyone else get all three for the question regarding 2 charged spheres, with one being held still and the other suspended?</p>
<p>what were the choices? I forget</p>
<p>I think the choices were I Gravity II Electrostatic Force (I think) III Tension of the string. I said that all three were true.</p>
<p>yup, that what I said.
Oh and do you guys remember the question about like the ammeter thing in a circut? there was a diagram drawn for it.</p>
<p>That was asking in which condition would the ammeter reading not change. I think I posted that earlier. Basically, the ammeter reading would not change if current is constant and the coil from the power source isn’t moving. This is because induced current is based on the derivative of the magnetic field, so changing the current or moving the coil would change the magnetic field experienced by the coil connected to the ammeter.</p>
<p>Hmm which choice was that. I chose C or something.</p>
<p>Anyone remember the one about estimating the height of the room? One of the options was diameter of the string. Somehow, I eliminated the other 4 choices and assumed that diameter is synonymous with length but now I regret it because it clearly means width. If only I could remember the other 4 choices.</p>
<p>I had no idea the SAT subject tests would be tricky like this. It’s so unlike SAT Is.</p>
<p>I thought the choice was B. In any case, I remember by what the answer said, not the letter.</p>
<p>As for estimating the height, you need the period because the thing acts as a pendulum.</p>
<p>Ya, I chose the period too because of the equation. Isnt it like 2piSqrt L/g or something?</p>
<p>Guys, is the curve in the blue book accurate?</p>
<p>No its not. It varies every time</p>
<p>What do you guys think the curve will be like? Everything depends on that…</p>
<p>I’d say the edge of an 800 is -12 or -13, which is what I’m hanging onto right now. :/</p>
<p>I’m not sure… I thought the test in the blue book was super easy… so maybe this curve will be more generous? :</p>
<p>^Really? Because in the PR book they said that a 60 and above is an 800. I doubt the curve is that harsh.</p>
<p>Yeah, the blue book was super easy. I’ve experienced this with both the SAT I and Physics. Even the curve was generous.</p>
<p>idk, the PR curve is really similar to the Blue Book one, but I thought the actual test was a lot harder than the PR tests too :</p>
<p>I doubt the curve varies that much and even if the true curve is harsher I’d say the test was harder this time so we can probably rely on the blue book curve</p>