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Postby JinwooLee_1F » Wed Oct 16, 2019 12:01 am

Which equation do I use to solve 1B.5? Also, it says that the energy is 140.511 keV. What is this unit and do I have to convert this to Joules?

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Re: 1B.5

Postby Mashkinadze_1D » Wed Oct 16, 2019 12:33 am

The unit eV is equal to 1.602 x 10^-19 J. Use standard conversion rates and mechanics from there.

Ashley Nguyen 2L
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Re: 1B.5

Postby Ashley Nguyen 2L » Wed Oct 16, 2019 3:28 am

An eV is an electron volt, so a keV is a kilo-electron volt. To convert this unit to Joules, first multiply by 1000 eV/1keV to get the number in normal eV units. Use the conversion factor 1 eV = 1.602 x 10^-19J to get joules. Once you have joules, use the equation E = (hc)/(wavelength) to receive wavelength.

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