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li5504552
Joined: 20 Jun 2007
Posts: 64
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 Posted: Sun Jul 08, 2007 11:56 pm Post subject: Question 18 |
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| -why is answer not a? I thought this was right in passage. Thanks. |
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mcat_premed3832
Joined: 19 Oct 2006
Posts: 413
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| Posted: Tue Jul 10, 2007 3:49 am Post subject: |
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| Admitedly, this question was not easy. The expression "critical size" is suggestive and P2 states that the reaction "will only occur" if the critical size is met. If that is not satisfied then nothing occurs and the number of neutrons becomes irrelevant. |
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jimmytech3124
Joined: 07 Apr 2008
Posts: 6
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| Posted: Thu May 01, 2008 2:29 pm Post subject: Re: #18 |
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[quote="li5504552"]-why is answer not a? I thought this was right in passage. Thanks.[/quote]
Passage states 3 neutrons from U235, not U238
"All of the neutrons released during nuclear fission are capable of splitting another 235U nucleus" |
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asfi
Joined: 09 Jul 2008
Posts: 15
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| Posted: Mon Jul 14, 2008 1:20 pm Post subject: |
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| so just becaues we don't know that the critical size was achieved the answer could not be c)(at least two neutrons from a 235U nucleus splitting anotehr 235U nucleus? |
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admin
Site Admin
Joined: 08 Dec 2003
Posts: 2176
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| Posted: Thu Jul 17, 2008 6:27 am Post subject: |
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| There are 2 points, one is the matter of the critical size; and the other point is that "Each reaction produces 3 neutrons" (P2) from U235 to U235 which is not any of the answer choices. |
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admin
Site Admin
Joined: 08 Dec 2003
Posts: 2176
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| Posted: Thu Jul 30, 2009 3:19 pm Post subject: |
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| Bump. |
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