|
GR8677 #41 |
|
|
Problem
|
|
 |
Atomic }Binding Energy
Nickel and Iron are the most tightly bound nuclei, thus have the highest binding energy. Nickel isn't on the list, thus Iron must be the choice.
|
|
|
Alternate Solutions |
Blake7
2007-07-23 17:44:43 | what if Iron wasn't on the list either?
I'm eyeballing a chart (Fig 13-3) in Anderson 'Intro to Modern' (p244) and it shows a curve with a rather flat, totally asymmetric peak of just under about 9MeV per at about A = 60 to 70, so to me that's from about Iron to Gemanium. (how am I to come up with 'the most abundant isotope'?)
Fortunately for us, Iron (C) is 'clearly' the only choice in this band. No doubt there's actually a relation defining this curve. (somewhere)
|  |
|
|
Comments |
evanb
2008-06-19 18:54:31 | A and B can be ruled out, or stars wouldn't frequently create many of the elements we enjoy in abundance on Earth.
D and E can be ruled out, because the binding energy is so low that they decay spontaneously. |  | Blake7
2007-07-23 17:44:43 | what if Iron wasn't on the list either?
I'm eyeballing a chart (Fig 13-3) in Anderson 'Intro to Modern' (p244) and it shows a curve with a rather flat, totally asymmetric peak of just under about 9MeV per at about A = 60 to 70, so to me that's from about Iron to Gemanium. (how am I to come up with 'the most abundant isotope'?)
Fortunately for us, Iron (C) is 'clearly' the only choice in this band. No doubt there's actually a relation defining this curve. (somewhere)
FortranMan
2008-10-26 14:18:56 |
 , where  is the difference between the total mass of the element if it was separated into its correct number of protons and neutrons and its atomic mass. Literally,
m_{n} - W)
note M = W*, where the * operator rounds the number to an integer.
|
FortranMan
2008-10-26 14:24:47 |
incomplete post of mine there. = binding energy per nucleon,  =mass of a proton,  = mass of a neutron, A = atomic number, W=atomic weight, M = atomic mass number (the integer value of W). Thankfully ETS isn't expecting you to be a chemist.
|
| |
|
| Post A Comment! |
|
|
Bare Basic LaTeX Rosetta Stone
|
LaTeX syntax supported through dollar sign wrappers $, ex., $\alpha^2_0$ produces  .
|
| type this... |
to get... |
| $\int_0^\infty$ |
 |
| $\partial$ |
 |
| $\Rightarrow$ |
|
| $\ddot{x},\dot{x}$ |
 |
| $\sqrt{z}$ |
 |
| $\langle my \rangle$ |
 |
| $\left( abacadabra \right)_{me}$ |
_{me}) |
| $\vec{E}$ |
 |
| $\frac{a}{b}$ |
 |
|
|
|
|
The Sidebar Chatbox...
Scroll to see it, or resize your browser to ignore it... |
|
|
|
