Recent content by ngc2024

Okay, I see. Thanks!

Homework Statement I have done a simple lab experiment to find the lattice constant for NaCl. Using a diffractometer, radioactive counts were measured as a function of crystal orientation angle for electron voltages of 20 and 30 kV. The average lattice constant found wasclose to the accepted...

Thank you, that was a brilliant answer!

I think Universe by Roger Freedman is quite good. It covers both concepts and (mostly) non-calculus math. It contains most of the concepts on your pdf.

I find most textbook explanations of resonance lacking. My understanding is that resonance occurs becuase less "driving energy" is lost when the driven frequency approaches the natural frequency of a system. But why does the energy loss curve like this? Since Q-factor is different for each...

Thank you both - that is very interesting!

So that means that a photon with energy corresponding to the energy difference between, say n=1 and n=2, would not be absorbed if n=3 is filled?

In introductory physics and chemistry, photon excitation is usually illstrated with a simple hydrogen molecule. I am wondering what happens if an electron is excited to an orbital that is already full. Would the orbital split up into different energy levels as hybridisation, so as not to violate...

Of course! Thanks!

"In particular, the two occurrences of "1" in the expansion given above have a completely different meaning." Yes, I was unsure of this. And maybe I was unclear - I used the binomial series to expand ## \sqrt{1+{x^2}} ## ## \sqrt{1+{x^2}} = \sum_{0}^{\infty }\binom{\frac{1}{2}}{n}{(x^2)^n} =...

Homework Statement "Use power series to evaluate the function at the given point" ## ln (x+ \sqrt{1+{x^2}}) - sin x ## at ## x = 0.001 ## Homework Equations Relevant power series: A: ## ln (1+x) = \Big( \sum_{n=0}^\infty\frac{({(-1)^{n+1}}{x^n})}{n} \Big) ## B: ## {(1+x)^p} =...

Thank you, but unfortunately not. The article maintaines that the formulas are equal, which other pages and my own formulas go against...

Homework Statement I am currently attempting to derive the haversine formula from the sperhical law of cosines. My only problem is that it seems to me that there is some kind of modification from the cosine law to the haversine. My question is if anyone knows what and why a modification has...

Thanks a lot for answering. In my experiment, however, I varied the velocity, so when I plotted the drag force vs velocity squared time surface area, I obtained a more or less straight line. However, the gradient was very different for each velocity. In addition, the Reynolds number for my data...

Lately, I have conducted an experiment where I dragged various circular cylinders through water in order to find the resistance, and hopefully also the drag coefficient. It seems to me that this coefficient is dependent on what is called the Reynolds number. Using some sources, I can easily find...