Practice Problem

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Brynne Keyser 1B
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Joined: Fri Apr 06, 2018 11:03 am

Practice Problem

Postby Brynne Keyser 1B » Wed Apr 18, 2018 11:00 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?

From a previous chemistry community post, I know that you use the KE = energy of a photon + work function equation, but I am confused as to how to find the kinetic energy.

Alicia Yu 1A
Posts: 30
Joined: Thu Feb 22, 2018 3:02 am

Re: Practice Problem

Postby Alicia Yu 1A » Thu Apr 19, 2018 12:42 am

Because there is zero kinetic energy given in the question, we know that the equation to use would be KE = Ep - energy needed to eject an electron (threshold). The threshold is given as 3.607 x 10-19 J and KE would be zero.
Solving algebraically for wavelength by setting Ep =


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