First of all get yourself a copy of the assignment:
Then open up this page of Links to help you search for extra information necessary to complete the assignment: open page of links
Then DO THE ASSIGNMENT
For Task 1 Merit Sub-Task you are to describe how the spectrum of an x-ray tube can be changed.
If you do not have access to an x-ray tube here is an on-line alternative:
"x-ray spectrum" program - Click here