### Test 2 Question 3c

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**Wed Oct 31, 2018 4:31 pm**Question 3, part c on test 2 asks the following:

In an X-ray photoelectron experiment, chromium metal is irradiated with light of wavelength 9.020x10^(-11)m.

c)Calculate the wavelength of the ejected electron.

From part a we know that the work function is 2.18x10^(-15) J and we know from the graph that the kinetic energy of the ejected electron is 2.00x10^(-17) J.

I used the equation E=hc/λ, and converted to λ=hc/E. I plugged in the constants and I used the given kinetic energy from the graph as E. Is this not the correct equation to use? What would be the correct answer? My answer was λ= 9.94x10^(-9) and I got 0 points for this problem.

In an X-ray photoelectron experiment, chromium metal is irradiated with light of wavelength 9.020x10^(-11)m.

c)Calculate the wavelength of the ejected electron.

From part a we know that the work function is 2.18x10^(-15) J and we know from the graph that the kinetic energy of the ejected electron is 2.00x10^(-17) J.

I used the equation E=hc/λ, and converted to λ=hc/E. I plugged in the constants and I used the given kinetic energy from the graph as E. Is this not the correct equation to use? What would be the correct answer? My answer was λ= 9.94x10^(-9) and I got 0 points for this problem.