se/physics/edexcel/questions","basePath":"/gcse/physics/edexcel/wave-properties-and-behaviour/questions","formulaUrl":null,"initialIndex":25,"initialQuestionWindow":[{"id":"27d70233-f616-4be7-9c77-6f52caebf0ad","revisionId":"19d6ab60-5d3b-48e5-9d9c-04b8b2781e6b","questionNumber":null,"questionType":"LA","specification":"","difficulty":3,"difficultyBand":"medium","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"0dfeb819-1e97-467a-ac2d-f4503feb4a48","label":null,"content":"An earthquake produces a seismic wave with a frequency of $25\\text{ Hz}$.\n\nThe wave speed of this seismic wave is $6.0\\text{ km/s}$.\n\nCalculate the wavelength of the seismic wave, in metres.\n\nUse the equation:\n\n$$\\text{wavelength} = \\frac{\\text{wave speed}}{\\text{frequency}}$$","markscheme":"- Converts the wave speed from $\\text{km/s}$ to $\\text{m/s}$: $6.0 \\times 1000 = 6000\\text{ m/s}$ B1\n- Substitutes values into the wave equation: $\\text{wavelength} = \\frac{6000}{25}$ M1\n- Calculates the final wavelength: $240\\text{ m}$ A1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"convert_then_substitute","label":"Convert then substitute","steps":[{"type":"text","order":1,"title":"Convert the speed","content":"The answer is required in metres, so the wave speed must be in metres per second.\n\nSince $1\\text{ km}=1000\\text{ m}$,\n\n$$6.0\\text{ km/s}=6.0\\times1000=6000\\text{ m/s}$$\n\nThis unit conversion earns the **B1** mark.","highlights":[{"text":"in metres","location":"specification"},{"text":"$$6.0\\text{ km/s}$","location":"specification"}]},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\text{wavelength}=\\frac{\\text{wave speed}}{\\text{frequency}}"},{"latex":"\\text{wavelength}=\\frac{\\htmlData{anchor=speed-value}{6000}}{\\htmlData{anchor=frequency-value}{25}}"}],"highlights":[{"color":"sky","style":"box","anchor":"speed-value"},{"color":"amber","style":"box","anchor":"frequency-value"}]},"order":2,"title":"Substitute the values","description":"Use the converted speed and the given frequency in the equation. This correct substitution earns the M1 mark."},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\text{wavelength}=\\frac{6000}{25}"},{"latex":"\\boxed{\\htmlData{anchor=final}{\\text{wavelength}=240\\text{ m}}}"}],"highlights":[{"color":"green","style":"box","anchor":"final"}]},"order":3,"title":"Calculate the wavelength","description":"Divide the speed by the frequency, then state the unit in metres. This correct final answer earns the A1 mark."}]}],"generatedAt":"2026-07-22T09:27:30.996Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"2b18fb37-e533-424a-9272-338b712b1366","revisionId":"64ffe4ef-467d-48c9-a29c-e11a3d2ff436","questionNumber":null,"questionType":"LA","specification":"A researcher on an offshore platform is monitoring ocean swells as they pass a vertical tide gauge attached to a support pillar, as shown in the diagram below.\n\n![Ocean swells passing a platform](https://assets.mathsgenie.co.uk/aqa-qb/e439e294-9024-414f-991b-a3bb719b527d.png)","difficulty":5,"difficultyBand":"medium","totalMarks":6,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"5150ff58-7866-4a6a-ab00-e24bbc3139a2","label":null,"content":"Describe how the researcher can determine the frequency of these ocean swells.","markscheme":"- Use the stopwatch to measure a fixed time interval, $t$, of at least 60 seconds M1\n- Count the total number of wave crests, $N$, that pass the tide gauge during this time interval A1\n- Calculate the frequency, $f$, using the formula $f = \\frac{N}{t}$ A1\n\n*Alternative Method:*\n- Use the stopwatch to measure the time, $t$, taken for a fixed number of wave crests (e.g., $N = 10$) to pass the tide gauge M1\n- Record the time $t$ in seconds A1\n- Calculate the frequency, $f$, using the formula $f = \\frac{N}{t}$ A1

Wave properties and behaviour

Question 7

Wave properties and behaviour Questions

Wave properties and behaviour

Question 7

Wave properties and behaviour Questions