okr491

Yes, it's correct, although it would be illegal if the product RT was equal to zero, since you cannot divide by zero. But, since neither R (gas constant), nor T (temperature) is ever zero, you can divide both sides by RT.

PV = nRT divide both sides by V P = nRT / V divide both sides by RT P / RT = n / V

OK, thanks swansont.

I'm reading an online PDF book about QM, and it starts off with basic experiments, like double slit and photoelectric effect. At the end of the chapter, there are a couple of simple questions and I need to see if I'm doing them correctly. Book: http://arxiv.org/pdf/1007.4184v1.pdf Chapter 1, 1.6 Conclusion, question 4: " You are doing the double-slit experiment with electrons. The distance between the slits is 1 cm, and the impact screen is at 1 meter from the slits. What speed should the electrons have in order to obtain an interference pattern with the bright bands separated by 0.1 m? (The mass of an electron is me = 9.11 × 10−31 kg.)" Now, there's an equation for constructive interference that goes like this: x = nλL / d, with x being position on detection screen, like on page 27. λ being wavelength of electrons, L being distance between slits and d being distance to the detection screen from the slits, and n being a whole integer. I solved above equation for λ and equation me × Ve = h / λ for λ and then equalized these two equations, but this x is the problem. Is that x what distance between bright bands will be? If so, then my result is 0.687 m/s for Ve. I'm aware that I could be very wrong.

" The breakdown voltage of an insulator is the minimum voltage that causes a portion of an insulator to become electrically conductible. " http://en.wikipedia.org/wiki/Breakdown_voltage Under normal conditions, air is an insulator, but if you apply enough voltage, it will conduct the electricity. " The dielectric breakdown strength of dry air, at Standard Temperature and Pressure (STP), between spherical electrodes is approximately 33 kV/cm. " http://en.wikipedia.org/wiki/High_voltage#Sparks_in_air - cited from A. H. Howatson, "An Introduction to Gas Discharges", Pergamom Press, Oxford, 1965, no ISBN - page 67 Some other sources state the necessary voltage as 19.5 kV (19,500 V) at a distance of 1cm. http://ethesis.nitrkl.ac.in/2875/1/Full_Thesis_Print_04.07.2011.pdf