# Recent content by dirtyhippy

1. ### Nucleus Ratio of nucleons between surface and core

Homework Statement We suppose the nucleon density of a spherical nucleus where r<R1 is constant, and where R1<r<R2 the density linearly decreases to 0 at R2. We call the surface nucleons (Number Ns) the number of nucleons contained in the volume R1<r<R2 and core nucleons (Nc) the number...
2. ### Deuterium (d,p) reaction Q-value

See this is on a french physics handout which has me bewildered as I'm not a chemist, but a little cross discipline never hurt. I think the d,p refers to deuterium proton which decays to a neutron. I think i'll go see my Professor and ask exactly what he's asking and post it up as I cant seem...
3. ### Deuterium (d,p) reaction Q-value

Homework Statement Express the energy (Or heat of the reaction Q) of the reaction (d,p) as a function of the binding energy of deuterium and the binding energy of the neutron captured by the target. Homework Equations Bn / A ≈ 8 MeV Bn = Binding energy, A = Atomic Number Q =...
4. ### Health Physics: Reactor Poll

Might be of help http://www.hss.doe.gov/nuclearsafety/ns/techstds/standard/hdbk1019/h1019v1.pdf
5. ### Bohr Model in Polar Co-ordinates

well in that case thankyou once again, much appreciated.
6. ### Bohr Model in Polar Co-ordinates

ah balls your right, ive been looking at this question too long. I had to translate it from french as well which probably isnt helping. I'll take a nap and come back to it later. but upto L=r m v sin theta is correct and v = r dθ/dt right, and theta being a constant means sin theta is also, so...
7. ### Bohr Model in Polar Co-ordinates

aha got it, thankyou, \vec{r} \times \vec{p} = \abs{{r}}\abs{{p}}sin\theta using dx/dt = sin (x) dθ/dt and p =mv we arrive at L = r mv sin θ L = r mv dθ/dt sin x where x is actually ⃗ux so we get L = r mv dθ/dt sin ( ⃗ux) I think this is correct, thankyou zachzach
8. ### Bohr Model in Polar Co-ordinates

Theta is the angle between the x-axis and r (as the electron goes round). Am I right in saying that it should be the magnitudes on the right hand side of your suggestion as opposed to vectors i.e. \vec{r} \times \vec{p} = \abs{{r}}\abs{{p}}sin\theta as then that may help me.
9. ### Bohr Model in Polar Co-ordinates

Sorry I should elaborate, when there is a ⃗ in front of a letter it means vector, if not its a scalar
10. ### Another Photoelectric effect problem

K.E max =eVstop = h(f-f0)=hc/λ - y (Work function) where f is freq, f0 is cutoff freq the work function (y) can be related f0 = y/h = c/λ0 hope that helps
11. ### Bohr Model in Polar Co-ordinates

The angular momentum of the Bohr atom is ⃗L = ⃗r× ⃗p Let the Oz axis of the unit vector ⃗uz be determined by the relation L = L⃗uz, in which L stands for the magnitude of the angular momentum vector ⃗L . (Basically L is in Positive z axis) We specify the position of the electron within its...