Convert MeV to V: How?

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Discussion Overview

The discussion centers around the conversion of MeV (mega-electron-volts) to V (volts), exploring the relationship between energy and electrical potential. Participants examine the differences between these units and the implications of their conversion in various contexts.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant asks if it is possible to convert MeV to V, specifically in the context of a particle emitted with an energy of 4.19 MeV.
  • Some participants clarify that eV is a unit of energy while V is a unit of electrical potential, indicating that they are not directly convertible.
  • Another participant explains that while you cannot convert MeV to V, you can relate the energy of a particle to the potential difference required to stop it, suggesting a potential difference of -4.19 MV.
  • Several participants express confusion regarding the relationship between eV and Joules, with one noting that they have not encountered problems requiring answers in Joules.
  • There is a discussion about scientific notation and the correct interpretation of energy units, with participants correcting each other's misunderstandings.

Areas of Agreement / Disagreement

Participants generally agree that MeV and V are different types of measurements and cannot be directly converted. However, there is disagreement and confusion regarding the relationship between eV and Joules, as well as the implications of these units in practical problems.

Contextual Notes

Some participants express uncertainty about their understanding of scientific notation and the conversion between energy units, indicating a need for clarification on these topics.

lightuplightup
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Hello- is it possible to convert MeV to V? If so, how is it done? For example if a particle is emmitted with an energy of 4.19MeV- how can this be changed into V? Any help is greatly appreciated.
 
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They are not the same unit of measure. eV is a unit of energy (1.602 x 10^19 ev = 1 Joule) and V is electrical potential. I think my intro to modern physics said its the energy required to move an electron through a 1 volt potential
 
lightuplightup said:
Hello- is it possible to convert MeV to V?

Is it possible to convert apples to oranges? The MeV (mega-electron-volt) is a unit of energy. The V (volt) is a unit of electrical potential difference.

The volt and the electron-volt are related in that if you take a particle that has a charge equal in magnitude to that on an electron (1.6e-19 coulomb) and accelerate or decelerate it by sending it through a potential difference of one volt, it will gain or lose one electron-volt of energy (which is just another name for 1.6e-19 J of energy).

For example if a particle is emmitted with an energy of 4.19MeV- how can this be changed into V?

You can't change the 4.19 MeV into V because they're different kinds of physical quantities. But you can say that in order to bring the particle to a stop, you'd have to send it through a potential difference of -4.19 MV (megavolts).
 
Simple newbie mistake. I was wondering how to convert eV to volts too. I saw it as "electron-volts" and "volts" and thought, pff, duh! has to be the same! lol.
 
Pengwuino said:
They are not the same unit of measure. eV is a unit of energy (1.602 x 10^19 ev = 1 Joule) and V is electrical potential. I think my intro to modern physics said its the energy required to move an electron through a 1 volt potential

You may want to rethink that... :wink:

Daniel.
 
What, what's wrong with that?
 
Everything.

[tex]1eV\simeq 1.6\cdot 10^{-19}J[/tex]

DO you see the difference...?

Daniel.
 
edited for screwing this up myself too.
 
Last edited:
Somehow...thinking if 1.602e^-19 J = 1eV then shouldn't 1.602e^19 eV = 1J... I have yet to do a homework problem or exam problem where i got the answer wrong... maybe its because i was rarely ever asked for an answer in Joules...
 
  • #10
No. Think about it. What do you divide 1.602e^-19 by to make it equal to 1?
 
  • #11
Pengwuino said:
Somehow...thinking if 1.602e^-19 J = 1eV then shouldn't 1.602e^19 eV = 1J... I have yet to do a homework problem or exam problem where i got the answer wrong... maybe its because i was rarely ever asked for an answer in Joules...

Need to review your scientific notation.

2E-03 = 0.002

The inverse of 2E-03 is not 2E+03 = 2000

Since 2000 * 0.002 = 4.
 
  • #12
Obviously all i thought was "pff, to get 1.602e^-19 to equal 1, you must multiply it by 1.602e^19! ". Just one of those things that for some reason, all your knowledge takes a day off and you think of the most assanine way of converting something.
 
  • #13
lol i like how the google targeted search result shows an advertisement for "Adult/Youth Basic Skills"
 

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