Converting Between keV and Joules

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Remi Lathrop 1G
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Joined: Fri Sep 29, 2017 7:07 am

Converting Between keV and Joules

Postby Remi Lathrop 1G » Fri Oct 13, 2017 3:23 pm

When I was working on problem 23 from chapter 1, the question states that the gamma ray photons emitted have a energy of 140.511 and asked for the wavelength of the gamma rays. When I checked the solution manual it showed that before plugging the given value into any equation you must multiply the given 140.511 x 10^3 eV by 1.6022 x 10^-19 J/eV.

I understand that we want our energy value in J, but why did they multiply by 1.6022 x 10^-19 ? And maybe more fundamentally what is a "keV"?

AnuPanneerselvam1H
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am

Re: Converting Between keV and Joules

Postby AnuPanneerselvam1H » Fri Oct 13, 2017 3:40 pm

1.6022 x 10^-19 J/eV is a ratio that is used to convert between the two units since most equations use Energy in Joules. Also I think k stands for kilo in this case. Therefore it would be 1.6022 x 10^-16J/ keV

Jordan Foster
Posts: 22
Joined: Fri Sep 29, 2017 7:06 am

Re: Converting Between keV and Joules

Postby Jordan Foster » Fri Oct 13, 2017 6:09 pm

Dr. Lavelle also mentioned that we do not need to memorize the conversions for units like KeW to J. We will be given conversion equations on a sheet of constants and equations so as long as you know how to use and manipulate the equations, you will be fine.

DAllaf
Posts: 20
Joined: Fri Sep 29, 2017 7:04 am

Re: Converting Between keV and Joules

Postby DAllaf » Sun Oct 15, 2017 2:37 pm

HI Remi,

In lecture Dr. Lavelle mentioned how we do not need to memorize unit conversions like that, because we would be provided a sheet full of equations and conversation during exams. So just try to practice problem solving and making the equations work together and you'll be fine.

Hope this helps


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