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Choose your guideBrowse our full library of free OCR A Level Physics revision sheets, worked examples and interactive tools — organised by module.
Browse resourcesMoving up a stage? Browse the OCR A & AQA transition guides (GCSE to AS and AS to A Level). Looking for revision routes? Start with OCR A Level Physics revision, A Level Physics MCQ practice, or A Level Physics problem solving practice.
Test your physics knowledge with a real daily question. Pick your level and give it a go!
In a school lab, a green laser produces a double-slit interference pattern on a screen 2.0 m away. The double-slit slide is replaced with one where the slit separation is half the original, while slit widths and the wavelength are unchanged. What happens to the spacing between adjacent bright fringes on the screen?
An electric lab heater is powered by an ideal 12 V dc supply. When new, the heater's resistance is 6.0 Ω. After use, oxidation increases its resistance by 50% but the supply voltage remains 12 V. Which statement about the power dissipated in the heater is correct?
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