A question on converting MeV to GeV

  • Context: Undergrad 
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Discussion Overview

The discussion revolves around converting binding energy values from MeV to GeV, specifically in the context of uranium-235. Participants explore the implications of using a graph that provides binding energy per nucleon and the correct method for conversion.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant questions the conversion process from MeV to GeV, noting a discrepancy in the mark scheme's instructions.
  • Another participant suggests that the graph may have shown binding energy per nucleon, which could affect the conversion calculation.
  • A participant acknowledges the error in interpreting the graph and discusses the multiplication of values but expresses confusion over the resulting magnitude of the answer.
  • There is a recognition of the mistake, leading to a resolution of the participant's initial confusion.

Areas of Agreement / Disagreement

Participants generally agree on the importance of understanding whether the graph represents binding energy per nucleon, but there remains some confusion about the conversion process and the resulting values.

Contextual Notes

The discussion highlights potential misunderstandings regarding the definitions of binding energy and the appropriate conversion factors, as well as the implications of using per nucleon values in calculations.

funnybunny
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hi - I'm stuck on a question...
use the graph to calculate the binding energy of uranium 235 nucleus:

the graph gave 7.6MeV

i need to give my answers to GeV - and the mark scheme told me to 7.6Mev x 235 to give 1.8GeV??

i thought you just multiplied by 10^3.

what happened?

thanks!
 
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funnybunny said:
hi - I'm stuck on a question...
use the graph to calculate the binding energy of uranium 235 nucleus:

the graph gave 7.6MeV

i need to give my answers to GeV - and the mark scheme told me to 7.6Mev x 235 to give 1.8GeV??

i thought you just multiplied by 10^3.

what happened?

thanks!
Welcome to PF funnybunny,

Are you sure that the graph didn't show binding energy per nucleon? :wink:
 
Hootenanny said:
Welcome to PF funnybunny,

Are you sure that the graph didn't show binding energy per nucleon? :wink:

yeh..it did...woops
but even if you multiplied it by 235, giving the total binding energy, it's still in MeV

i did 7.6x10^6 x 235 x 10^3 which gave 1.8x10^12...which is waay too big
 
Hootenanny said:
Welcome to PF funnybunny,

Are you sure that the graph didn't show binding energy per nucleon? :wink:

nvm - I'm such a klutz! thanks!
i got the answer
 

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