9. (1 pt +

4 pts for LONG ANSWER WRITE UP

.) Your long answer will be graded

using the following rubric:

a)

Identifying the physical principles or key ideas (expressed in words) that

apply to the problem and your strategy for approaching the problem: 2 if

correct, 0 if irrelevant principle/ideas, 1 if have both some relevant and some

irrelevant principles/ideas.)

b)

Including a useful picture that is helpful in solving the problem (include

information that help you think about what is happening!)

(2 for a useful

picture, 1 for a picture that is not particularly useful, 0 for a non-useful picture or

no picture)

c)

Explaining (in words) the reasoning that goes along with the equations/math

you are doing.

(2 for correct explanation, 1 for mostly correct or incomplete

explanations, 0 for incorrect explanations)

d)

Showing the details of your solution (equations/math)

(2 for correct

equations/solution, 1 for mostly correct or incomplete equations/solution, 0 for

incorrect equations/solution)

e)

Clarity of solution.

(2 if good, 1 if difficult but can be figured out, 0 if

incomprehensible. If 0 here, all the others will be left blank.)

You have a plate of metal, but you have no idea what kind of metal it is. You come up

with the brilliant idea of measuring the work function of this metal by using it as the

target in a photoelectric effect experiment. You can perform this experiment virtually by

selecting '???' as the target in the simulation. What is the work function, in eV, of the

mystery metal?

sim: Photoelectric Effect - Light | Quantum Mechanics | Photons - PhET Interactive Simulations (colorado.edu)

https://phet.colorado.edu/en/simulations/photoelectric

then the follow up question is just "What is the mystery metal?" and offers options:

Sodium (Na)

Calcium (Ca)

Cadmium (Cd)

Aluminum (Al)

Silver (Ag)

Platinum (Pt)

Magnesium (Mg)

Nickel (Ni)

Selenium (Se)

Lead (Pb)