2 Powerpoint presentations used to support students’ independent study. Ideally these would be posted on the schools VLE or similar and accompanied by a M/C quiz to allow students to test their knowledge and understanding. Some VLEs provide the facility to mark and report to you the results of the quizzes.
The worksheet on cyclotrons is an example of differentiated questions. Personally I would direct the more able students to the higher demand side of the sheet while leaving the rest to choose their level of challenge.