Recent content by exzacklyright

Homework Statement Suppose that total population inversion could be achieved in a ruby laser. If half of the electrons in E2 could then drop to E1 in 30 ns, what would be the avg power of the resulting laser pulse over this time interval? Assume that the ruby crystal is a cylinder 5.00cm long...

ah sorry. in the example problem it's 4.3 but in the homework problem it's 4.05

Since the crystal structure of Na is bcc, there are two Na atoms in each conventional unit cell of volume a^3. Denisty n= 2/a^3... so 2/(4.3e-10)^3=2.52e28

The equation I think I got to use is : \tau=(\sigma*m)/ (n*e^2) n= 2.52 e28 sigma = 2.38e7 and I'm guessing e = 1.6e-19 but i got the wrong answer.

valence Z=1, lattice param a = 4.05 conductivity = 1.76e7 . What's the avg time between collisions of a conduction electron in this metal (bcc structure).really have no idea lol

well all we're given is density 1 and theta 1. we don't even know density2 or theta2

Homework Statement A crystal is heated from 0 to 100 degrees celcius, its lattice parameter 'a' increases by 0.17% due to thermal expansion. if we observe an x-ray reflection at a bragg angle theta= 19.3 degrees at 0 degrees celcius, by how much will theta change when the sample is heated to...

yeah I figured it out. thx.

Homework Statement Two speakers located 4.0 m apart. Listener is seated 25.0m from 1 speaker, and 27.0m from the other. We drive the two speakers at a freq. which we sweep from 100 to 500 Hz. If the 2 speakers are in phase, find the frequencies at which the waves constructively/destructively...

"Consider a diamond crystal containing 1 mole of carbon (6.022e23)atoms. It is found that the energy required to separate all the C atoms from each other to an infinite distance apart is 710kJ. ?Binding Energy." I really have no idea where to start. I've looked online for other things but...