
AQA A-level Physics Turning Points lesson on cathode rays and thermionic emission. 16 editable slides, 29-mark worksheet, mark scheme and PDFs.
What’s in the PowerPoint
• An energy recap starter, with answers in the speaker notes
• How a discharge tube produces cathode rays, step by step
• What Thomson showed about cathode rays
• Thermionic emission and the electron gun, with a labelled diagram
• eV = ½mv² and the electronvolt
• Two worked examples: finding speed from p.d. and p.d. from speed
• A common mistakes slide
• Six check questions with answers, and an exit ticket
• Teacher notes on every slide: textbook pages, spec references, misconceptions and demo ideas
What’s in the worksheet (29 marks)
• Recall of cathode rays and thermionic emission
• Electronvolt conversions and electron speed calculations
• Explaining how a discharge tube produces cathode rays
• Drawing and explaining an electron gun, and Thomson’s conclusions
• A full mark scheme with mark points, on separate pages
• PDF copies of the slides, the student worksheet (no answers) and the mark scheme, ready to print
Good for
First teaching, revision, homework, cover lessons or independent study. The PowerPoint and Word files are fully editable, and the PDFs are ready to print or share with students.
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