Recent content by Lily Wright

Ohhh ok thanks. So I0 is 1.34 x 1019, the number of photons per second? So we have 1.34 x 1019 e(-400x2x10-3x10) which gives me 4.495 x 1015, and this is also in photons per second?

Thanks! OK sorry but how do I find the cross-section? and then I would just divide number of protons per second by this? Using pV=nRT I can rearrange for number of moles n = pV/RT so if I have the volume I can work out no of moles I just don't really see where I'm supposed to get that from

Homework Statement A cell of length 10 cm, containing gaseous IBr at 300 K and 5 Pa pressure is irradiated by a continuous wave laser operating at a wavelength of 532 nm and a power of 5 W. (i) Calculate the energy of the photons. Express your answer in units of J, cm-1 and eV. From the power...

Homework Statement Homework Equations It = I∞ (1-2 exp -τ/T1) Or I've got T1 = τn/ln2 where τn is the τ at node (M = 0) The Attempt at a Solution So would I plot τ vs amplitude on a graph and then what? Everything I've found seems to use a programme to do it?

Homework Statement In an NMR spectrum a CH2 group has a peak centred at 9.81 ppm. What is the shift in Larmor frequency of the protons from that of an unshielded proton if the spectrometer magnetic field is 9.4 T? The magnetogyric ratio of an unshielded proton is γH = 26.75 × 107 rad s-1T-1 2...

Ah ok so would I just work it out for each velocity?

Homework Statement Use the Maxwell-Boltzmann distribution of speeds to find the fraction of F2 molecules at 500 K which have speeds in the range 240 to 250 m s -1 (HINT: determine the fraction of the total area under the distribution curve represented by the part between these two speeds...

Homework Statement 2. Homework Equations [/B] Uploaded as a picture as it's pretty hard to type out The Attempt at a Solution So to normalise a wavefunction it has to equal 1 when squared. A is the normalisation factor so we have: A.x2e-x/2a0.x2e-x/2a0 = 1 ∫ψ*ψdx = A2∫x4e-axdx = 1 Then I've...

Homework Statement If a one-dimensional box is 1 nm long, what is the probability of finding the particle between the following limits? (a) x = 0 nm and x = 0.05 nm (b) x = 0.55 nm and x = 0.65 nm Homework Equations ψ = (2/L)½ sin(πx/L) The Attempt at a Solution (I do chemistry and I'm really...