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Read this weekMoving 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 lab rig, a mass is hung from a plate attached to the ceiling by two branches in parallel. Branch 1 is a single light spring of constant k. Branch 2 is two identical light springs, each of constant k, connected in series. The branches share the same extension when loaded. Compared with using only the single spring on its own for the same mass, which statement must be true?
In a school lab, a GM tube measures background radiation at 40 s⁻¹. With a sealed source at a fixed distance, the initial total count rate is 1040 s⁻¹. Several hours later, under identical setup, the total count rate is 140 s⁻¹. Assuming the detector response and geometry are unchanged, which statement must be true about the time elapsed?
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