Problem 1.33 part c

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Shirley Wong 2E
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Joined: Fri Sep 25, 2015 3:00 am

Problem 1.33 part c

Postby Shirley Wong 2E » Sat Oct 03, 2015 1:35 am

I was able to do part a and b of 1.33 in the textbook, but I'm completely stumped on part c) What is the wavelength of the radiation that caused photoejection of the electron? Thank you!

Umair Khan 2G
Posts: 32
Joined: Fri Sep 25, 2015 3:00 am

Re: Problem 1.33 part c

Postby Umair Khan 2G » Sat Oct 03, 2015 11:59 am

For part c, we use the formula for the photoelectric effect: E(photon) - = E(kinetic)

Since part A gave us the velocity of the ejected electron we can find the E(kinetic) with E(k) =, with m being the mass of the electron and v being the given velocity.
In part B we solved for the threshold (the energy required to remove the electron)
We can rearrange the formula to give us:E(photon) = E(kinetic) +

Solving this will give us the energy of the photon: E = h x v which is the same as

From here we can solve for to give us the wavelength.

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