HW problem Focus 1 B5 7th edition

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abbydouglas1K
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Joined: Fri Sep 28, 2018 12:26 am

HW problem Focus 1 B5 7th edition

Postby abbydouglas1K » Thu Oct 11, 2018 11:29 pm

The problem asks to solve for the wavelength of yrays with an energy of 140.511 keV and I am not sure how to convert these units to joules or if I need to convert them at all.
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Chloe Thorpe 1J
Posts: 77
Joined: Fri Sep 28, 2018 12:16 am

Re: HW problem Focus 1 B5 7th edition

Postby Chloe Thorpe 1J » Thu Oct 11, 2018 11:40 pm

I believe 1 keV is equal to 1.6022 x 10^-16 J, so you'd just multiply the amount of keV by that number to convert the units.

140.511 keV * (1.6022*10^-16 J / 1 keV) = 2.25*10^-14 J
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Joon Chang 2F
Posts: 59
Joined: Fri Sep 28, 2018 12:25 am

Re: HW problem Focus 1 B5 7th edition

Postby Joon Chang 2F » Thu Oct 11, 2018 11:46 pm

1keV=1,000 eV = 1.60218x10^-19 J. Use this to convert the units and solve using .
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