Post-Assessment #31  [ENDORSED]

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Alysia Garcia 1B
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Joined: Wed Feb 21, 2018 3:02 am

Post-Assessment #31

Postby Alysia Garcia 1B » Fri Apr 20, 2018 12:49 pm

If 3.607 x 10-19 J is required to remove an electron with zero kinetic energy from a metal surface, what would be the longest wavelength light that could do this?
I understand that you have to use Ek= Energy of incoming photon - work function, but what would I use for the kinetic energy?

Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

Re: Post-Assessment #31

Postby NabilaNizam-1K » Fri Apr 20, 2018 1:34 pm

If you are calculating the kinetic energy of the ejected electron, you can use the equation
where m=mass of an electron and v=velocity of the electron after it's ejected

Sam Metzger 1C
Posts: 25
Joined: Wed Apr 04, 2018 3:00 am

Re: Post-Assessment #31  [ENDORSED]

Postby Sam Metzger 1C » Sat Apr 21, 2018 3:54 pm

For this problem, the kinetic energy is zero so the energy of the photon would equal the work energy. From here, we can find the wavelength by using the equations E=hv and c=v(wavelength) and solve for the wavelength.

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