# eelnedross

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• Gender
Female
• Exams
Nov 2012
• Country
1. ## Physics HL/SL Help

Can someone please adress the following syllabus points for me? I can't find them in my textbook and the exam is near! A.6.9 Outline qualitatively the action of liquid-crystal displays (LCDs). E.3.10 Explain how stellar distance may be determined using apparent brightness and luminosity. E.3.14 State the relationship between period and absolute magnitude for Cepheid variables E.3.16 Determine the distance to a Cepheid variable using the luminosity–period relationship. Thank you very much for all of your support IBS!
2. ## Physics HL/SL Help

Why is the distance of 10pc in absolute magnitude taken? Because it could be 20, 30 or even 40pc! Can someone please explain spectroscopic parallax to me? I'm sorry for asking too much questions, my final Physics IB exam is in 1 week and a half.
3. ## Physics HL/SL Help

Hey, can someone outline the nature of spectroscopic binary stars and eclipsing binary stars? I can't explain them fully... Also, how can we determine the composition of a star using absorption spectra? I'm lost on that one, and when it includes the Doppler shift!
4. ## Physics HL/SL Help

I would assume that by "second harmonic frequency" the question is referring to the next higher resonant frequency, which would indeed be three times that of the fundamental. So the third harmonic would have a resonant frequency five times that of the fundamental? And what does it mean exactly with "resonant frequency"? The natural frequency of oscillation which gives the highest amplitude for the oscillation, if i'm not mistaken? Thank you as always Mr. Higgs! Yes, it is much more common practice to number the harmonics by the corresponding multiple of the fundamental frequency. But the que
5. ## Physics HL/SL Help

I would assume that by "second harmonic frequency" the question is referring to the next higher resonant frequency, which would indeed be three times that of the fundamental. So the third harmonic would have a resonant frequency five times that of the fundamental? And what does it mean exactly with "resonant frequency"? The natural frequency of oscillation which gives the highest amplitude for the oscillation, if i'm not mistaken? Thank you as always Mr. Higgs!
6. ## Physics HL/SL Help

Another question for ya IBS! I thought that a pipe closed at one end only had the first harmonic, third harmonic, fifth harmonic and so on... How would you do this one?
7. ## Language Pen-Pals

1) Julia 2) English B 3) Spanish A1 4) PM me for more details
8. ## Is my geo ee not really geo related? Any tips for a physical geo EE?

I would also think that it's worth for a "C". To be honest, that is more Biology than Geography. What you can do is to investigate the management of a river or groundwater resources near your city. That can be an interesting topic in which you can get a lot of relevant data! And yes, I think it may be a little bit to soon for you to hand in your EE this Friday. My final deadline was near early-September, so i guess that they will take your EE near late February or early March. You don't have much time left, and you should hurry in order to get at least a "B"! Good luck! I'm sure that you'll be
9. ## Physics HL/SL Help

A question,is apparent magnitude the same as brightness? Also, for calculating ratios of luminosities, should i use the difference in apparent or absolute magnitudes? On the other hand, say you have a mass of 940 MeV c-2, the energy released in the nuclear reaction is 940 MeV? Thank you very much! My exams are nearly in 2 weeks and i'm worried!
10. ## Physics HL/SL Help

Hey IBS! Another questions for ya! I know how to solve question a). However, i can't seem to solve question b)! Have you guys got any idea? The answer seems to be 250Hz...
11. ## Physics HL/SL Help

This question was easy, but i'm not sure at the moment with question f)ii). Does anyone know how to solve it? I've tried everything but nothing happens. I only get answers around the 1.0V range, but the answer is around 0.4V. Thanks!
12. ## Physics HL/SL Help

To IB Smacher: It is the unit for energy density! On the other hand, does anyone know how to solve this question? Say, is there a strict relationship between the period and the displacement? Or just the frequency? Also, how can someone define a phase difference? What does it mean? A difference between periods? Furthermore, how to tackle this question? The only answer i can get is B (Unless my mathematics is failing me...) Thank you IBS!!
13. ## Physics HL/SL Help

Hey! This question seems to be easy, but the last one has been difficult for me to solve. How can i resolve it without any numbers for the resistance? Or use P = VI? Thank you!
14. ## Lab Report SMH Physics Design Lab

Hello IBS, i'm doing a design experiment on SMH and i've run out of ideas. I tried to study the energy changes when a pendulum bob colides with a cart in the floor, but that turned out to be too complex. Now, i don't know where to even start as my classmates are already analyzing the effect of the length of the pendulum string, the mass of the pendulum bob or the amplitude of oscilation. Someone else is doing something related to springs, but it has a lot of uncertainities. What should I try to study? I was thinking of measuring speed, but not sure how to!
15. ## Physics HL/SL Help

I don't know about the shallow water thing but I can tell you that shallower water doesn't make it less or more dense, it's still water The little lines you have drawn are correct if that's what you were asking and I believe those are away from the normal. The straight arrow that runs through the waves in region A is the normal and the waves you have slightly drawn in region B redirect away from it. If the waves have less speed in medium B, shouldn't they be refracted towards the normal? Thanks for answering!
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