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you need to know everything. stopping voltage is definately in the syllabus. it's part of the experiement where you graph the line to find plancks constant, work function etc.

wtf... we didn't do any pracs on semi conductors... are we required to know this?

OK, so an emf is induced in an area of changing magnetic flux right? this is basic. In your case, you have a metal sheet and the emf produced here is an eddy current. When an area of the metal is moved from an area inside a magnetic field to an area without, an eddy current is induced due to a...

there will only be a eddy current when a part of that metal is outside of the magnetic field. So, with the direction of movement going right, an eddy current will be induced in an anticlockwise motion where it goes down in the part of the metal still within the magnetic field and goes up in the...