| Topic: |
Science > Physics |
| User: |
"Jamie" |
| Date: |
27 Mar 2005 05:37:47 AM |
| Object: |
Quick Question of Cross Sections |
If a beam of alpha particles are incident on a Cd (A=113, Z=48) foil
of thickness 1mm. An alpha particle detector of cross-sectional area
10cm^2 is placed 1/2 m from the foil to detect alpha particles back
scattered through 135 degrees. The incident alpha particle flux is
10^8 m^-2s^-1, the cross sectional area of the incident beam is 10cm^2
and the average cound rate is 1.2 alpha particles per second.
Density of Cd =8.65x10^2kgm^-3, Atomic mass of Cd =112.9044u,
The differential scattering cross section in barns per steradiam for
scattering through 135 degrees is:
The choices are: 0.6505, 0.0001301, 1.301, 6.505, 0.00006505, 13.01 i
have done a calculation and come out with 0.6505 as the DSCS but i am
not sure. Would it be possible for some help?
Kind regards,
Jamie
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| User: "" |
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| Title: Re: Quick Question of Cross Sections |
27 Mar 2005 10:20:53 PM |
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Jamie wrote:
If a beam of alpha particles are incident on a Cd (A=113, Z=48) foil
of thickness 1mm. An alpha particle detector of cross-sectional area
10cm^2 is placed 1/2 m from the foil to detect alpha particles back
scattered through 135 degrees. The incident alpha particle flux is
10^8 m^-2s^-1, the cross sectional area of the incident beam is
10cm^2
and the average cound rate is 1.2 alpha particles per second.
Density of Cd =8.65x10^2kgm^-3, Atomic mass of Cd =112.9044u,
The differential scattering cross section in barns per steradiam for
scattering through 135 degrees is:
The choices are: 0.6505, 0.0001301, 1.301, 6.505, 0.00006505, 13.01 i
have done a calculation and come out with 0.6505 as the DSCS but i am
not sure. Would it be possible for some help?
Kind regards,
Jamie
Jamie--tuff choice--1 out of 6 odds for guessing right. Hmmmm-- same
odds as betting on a 7 at the craps table, but a 7 pays 5 to 1. If it
were me, I'd bet on .6505 and hope--ya winsz some and ya lossez some.
Please let us know how it turns out.
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| User: "GR_GR" |
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| Title: Re: Quick Question of Cross Sections |
27 Mar 2005 07:36:53 AM |
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Jamie wrote:
If a beam of alpha particles are incident on a Cd (A=113, Z=48) foil
of thickness 1mm. An alpha particle detector of cross-sectional area
10cm^2 is placed 1/2 m from the foil to detect alpha particles back
scattered through 135 degrees. The incident alpha particle flux is
10^8 m^-2s^-1, the cross sectional area of the incident beam is 10cm^2
and the average cound rate is 1.2 alpha particles per second.
Density of Cd =8.65x10^2kgm^-3, Atomic mass of Cd =112.9044u,
The differential scattering cross section in barns per steradiam for
scattering through 135 degrees is:
The choices are: 0.6505, 0.0001301, 1.301, 6.505, 0.00006505, 13.01 i
have done a calculation and come out with 0.6505 as the DSCS but i am
not sure. Would it be possible for some help?
Kind regards,
This is the second problem that you have posted without showing if you
have even attempted the calculations yourself.
How do you expect to learn anything if you expect other people to do
your homework for you?
From appearances, it seems that you have procrastinated on your
homework set, and with the coming Monday submission date you are
desperate to have others do the work for you.
Well sod off twat. Suffer.
http://www.sodoff.com/
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| User: "Jamie" |
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| Title: Re: Quick Question of Cross Sections |
27 Mar 2005 01:22:16 PM |
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see other post please.
Kind regards,
Jamie
ps politeness still does exist in the world today
GR_GR <> wrote in message news:<d26cu0$hfs$1@peabody.colorado.edu>...
Jamie wrote:
If a beam of alpha particles are incident on a Cd (A=113, Z=48) foil
of thickness 1mm. An alpha particle detector of cross-sectional area
10cm^2 is placed 1/2 m from the foil to detect alpha particles back
scattered through 135 degrees. The incident alpha particle flux is
10^8 m^-2s^-1, the cross sectional area of the incident beam is 10cm^2
and the average cound rate is 1.2 alpha particles per second.
Density of Cd =8.65x10^2kgm^-3, Atomic mass of Cd =112.9044u,
The differential scattering cross section in barns per steradiam for
scattering through 135 degrees is:
The choices are: 0.6505, 0.0001301, 1.301, 6.505, 0.00006505, 13.01 i
have done a calculation and come out with 0.6505 as the DSCS but i am
not sure. Would it be possible for some help?
Kind regards,
This is the second problem that you have posted without showing if you
have even attempted the calculations yourself.
How do you expect to learn anything if you expect other people to do
your homework for you?
From appearances, it seems that you have procrastinated on your
homework set, and with the coming Monday submission date you are
desperate to have others do the work for you.
Well sod off twat. Suffer.
http://www.sodoff.com/
.
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