Convert MeV to V: How?

[lightuplightup]

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.

 

[Pengwuino]

They are not teh 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

 

[jtbell]

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).

 

[Pengwuino]

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.

 

[dextercioby]

They are not teh 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...

Daniel.

 

[Pengwuino]

What, what's wrong with that?

 

[dextercioby]

Everything.

1eV\simeq 1.6\cdot 10^{-19}J

DO you see the difference...?

Daniel.

 

[inha]

edited for screwing this up myself too.

 

[Pengwuino]

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...

 

[inha]

No. Think about it. What do you divide 1.602e^-19 by to make it equal to 1?

 

[juvenal]

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.

 

[Pengwuino]

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.

 

[Pengwuino]

lol i like how the google targeted search result shows an advertisement for "Adult/Youth Basic Skills"