<p>^Ethereality
You mean the one that asks for the speed? But i thought it was trarvelling at 2*10^8, and askes u how fast would the observers on earth see?</p>
<p>For the rocket ship it asked about a laser being fired. Lasers travel at the speed of light so 3E8 m/s is the right answer.</p>
<p>The quasar existed around the beginning of the universe because light from 5 billion years ago is now reaching us. </p>
<p>The one on point P was higher/lower. It wasn’t a maximum or minimum. The waves met at a .3 which wasn’t a crest or trough.</p>
<p>^wowow
i said it belongs to galaxy like milky way, i totally have no idea how to do it…:(</p>
<p>pseudoreal, your answer was then D, correct?</p>
<p>The ship was moving at 2 x 10^8 m/s, and was emitting light toward the planet. The question asked at what speed does the speed of light move relative to an observer on earth. They wanted you to just add the velocities of the ship and light (which is 3 x 10^8), but that’s not possible. The limit to speed is the speed of light, so the answer was just 3 x 10^8.</p>
<p>My answer was D for which question? The wave/interference one? I think so.</p>
<p>what’s the wave/interference one? You mean the two in phase wavelenth one? … I put the amplitude is higher than any point on L, and it was B I think…</p>
<p>I omitted 3 and got 2 wrong so far… Shoot -_-… Any other questions?</p>
<p>In section one.
There are three given waves, one asks you which are transvers, one asks you which causes diffraction and one ask you somthing else… Do anyone remember that question?</p>
<p>Waves on a violin cannot be diffracted. Both they and light waves are transverse.</p>
<p>I remember putting 1 and 3 only for the transverse waves. It was light and vibrations on a string I Think. I dont really remember the diffraction problem though</p>
<p>i thought only light is transverse wave…</p>
<p>No, wave on a string is also transverse. Think about how it vibrates (up and down aka perp)</p>
<p>What do you guys think the curve for 800 will be? Maybe -15?</p>
<p>Wat about the parallel plates one and the mirror one for parrallel rays??</p>
<p>What kind of waves transported energy.</p>
<p>I put that all waves have energy and i only put that you have to bend the mirror to get parallel rays back</p>
<p>I think a raw score of 60 is too low for an 800… maybe around -10-12…?</p>
<p>According to the Collegeboard test, you can have a scaled 59 to get an 800 on that one. In princeton, scaled 60. </p>
<p>Parallel plates…you had to know the equation E*A/(d)</p>
<p>so the answer woul dhave to have the greatest AREA and least DISTANCE. I think it was B (6=a and 1=d)</p>
<p>for wave energy i put bend mirro + move it backwards</p>