Newton wrote:So I just go back from taking the PGRE in Munich. Long day. Woke up at 4AM, drove an hour to the train station, then took a 2 hour train to Munich...
I didn't think it was too bad. Most of the questions hardly took much thinking if you knew the basics. There were no tedious ones with Maxwell-Boltzmann statistics/Partition Functions or the likes However, I did leave around 15-20 blank. I answered about 70 on the first pass then when back and looked at the ones I skipped and did 50/50 guesses on some, but I ended up running out of time before I could look at the ones in the back of the exam. I distinctly remember telling myself on the first pass I was wasting too much time thinking about tough ones. Some of the ones I skipped were you either knew the factoid or not. O well
What are your thoughts?
P.S. some students didn't even bring No.2 pencils... how dense are these people?!?!
Newton wrote:What did you put for the question that had something like the "expectation value" of the Hamiltonian, with wave-functions n & m and energy states n and m?
Izaac wrote: Now, QUESTION! I had this question about a particle having momentum mc; the question was, what is the kinetic energy?
Among the answers, there was some variations of the traditional , but I decided on the last one, the infinity. I mean, a non-zero mass particle going at speed of light is by definition impossible, so an impossible energy seemed the only senseful answer to me...
What do you think about it?
Newton wrote:I had planned to take the PGRE in October but I didn't sign up soon enough and I would NOT have been ready I don't think. Two weeks is not enough.
Yeah, I took too much time on the NaCl question and I didn't know exactly the approach so I didn't guess. I don't remember the the kinectic energy problem but what about the percent error in the measurement of the kinetic energy when you know velocity within 10%?? I was sort of unsure about that one?!
hooverbm wrote:The current exam looks to be about the same difficulty as the 2008 exam. I would expect the scoring to be very similar.
Also I noticed that my scores are being sent to the WRONG universities... when I asked them to change it via email twice months ago! The changes even showed up on the page back then after about a week. So infuriating, looks like I'll have to shell out another 25-50$ to ETS...
Lavabug wrote:Newton wrote:What did you put for the question that had something like the "expectation value" of the Hamiltonian, with wave-functions n & m and energy states n and m?
There was only 1 that made sense, the one with the Kronecker delta.
God I was really hoping not to give into the temptation of checking my answers... but the one on distances in NaCl... I think it was a trick question, I hope 2r was the correct distance between contiguous Na+ ions given that r was the distance between Na+ Cl-. They probably mentioned FCC structure to distract...
I really rushed through a lot of them barely reading the question, just looking for keywords. Kinda had doubts about the spherical harmonic question, I'm not sure if I read it correctly but if it was for m=0, then it was ccostheta. I hope the question didn't say l=0... I never remembered these things, on my quantum mechanics exam we would be given Clebsh-Gordan tables because knowing equations were the least of our worries.
Pretty embarrassed for not figuring out the telescope problem quickly, considering I'm applying to astronomy programs mainly.
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