/physics/ocr/questions","basePath":"/gcse/physics/ocr/the-electromagnetic-spectrum/questions","formulaUrl":"https://www.ocr.org.uk/Images/705129-equation-sheet-physics-a.pdf","initialIndex":21,"initialQuestionWindow":[{"id":"5303815e-6149-4f2a-99e8-5c2fa75261c1","revisionId":"2f9ed7c1-e041-40f6-8421-d64191469898","questionNumber":null,"questionType":"LA","specification":"A red-dwarf candidate star emits radiation as electromagnetic waves.","difficulty":3,"difficultyBand":"easy","totalMarks":8,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"3fe8789d-81dd-4fd2-b844-95b2c2435005","label":"a","content":"Part of the electromagnetic spectrum is shown in the table below:\n\n| Radio waves | Microwaves | [ 1 ] | Visible | [ 2 ] | [ 3 ] | Gamma-rays |\n| :---: | :---: | :---: | :---: | :---: | :---: | :---: |\n\nComplete the table by filling in the blanks [ 1 ], [ 2 ], and [ 3 ] with the correct electromagnetic waves in order of **increasing** frequency.\nUse the words from this list:\n* **infrared**\n* **X-rays**\n* **ultra-violet**","markscheme":"- [ 1 ] infrared B1\n- [ 2 ] ultra-violet B1\n- [ 3 ] X-rays B1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"spectrum_order","label":"Order the spectrum","steps":[{"type":"text","order":0,"title":"Follow the frequency direction","content":"The table runs from left to right in **increasing** frequency. Use the fixed entries, especially **Visible**, to place each word from the list in its correct gap.","highlights":[{"text":"in order of **increasing** frequency","location":"specification"}]},{"type":"text","order":1,"title":"Place infrared","content":"Infrared comes after microwaves and before visible light, so write **infrared** in $[1]$. This earns the first **B1** mark.","highlights":[{"text":"[ 1 ]","location":"specification"},{"text":"**infrared**","location":"specification"}]},{"type":"text","order":2,"title":"Place ultra-violet","content":"Ultra-violet comes immediately after visible light, so write **ultra-violet** in $[2]$. This earns the second **B1** mark.","highlights":[{"text":"[ 2 ]","location":"specification"},{"text":"**ultra-violet**","location":"specification"}]},{"type":"text","order":3,"title":"Place X-rays","content":"X-rays come after ultra-violet and before gamma-rays, so write **X-rays** in $[3]$. This earns the third **B1** mark.","highlights":[{"text":"[ 3 ]","location":"specification"},{"text":"**X-rays**","location":"specification"}]}]}],"generatedAt":"2026-07-22T12:16:03.978Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"25cd42f1-c9ba-4166-9e5e-5cee46d264cc","label":"b","content":"Complete the sentence about electromagnetic waves in a vacuum:\n*As the wavelength of an electromagnetic wave increases, its frequency __________ and its speed __________.*\nUse the terms: **decreases**, **increases**, or **stays the same**.","markscheme":"- decreases B1\n- stays the same B1","marks":2,"order":1,"markingRubric":null,"explanation":{"methods":[{"id":"wave_equation","label":"Use the wave equation","steps":[{"type":"text","order":0,"title":"Recall the wave rule","content":"For electromagnetic waves travelling **in a vacuum**, the wave speed is fixed: it is the speed of light. The relationship is\n\n$$c=f\\lambda$$\n\nwhere $c$ is wave speed, $f$ is frequency and $\\lambda$ is wavelength.\n\nThis identifies the two quantities you must compare.","highlights":[{"text":"As the wavelength of an electromagnetic wave increases, its frequency __________ and its speed __________.","location":"specification"},{"text":"in a vacuum","location":"specification"}]},{"type":"text","order":1,"title":"Link wavelength and frequency","content":"In a vacuum, electromagnetic waves all travel at the same speed, $c$. Using $c=f\\lambda$, this means $f=\\frac{c}{\\lambda}$: with $c$ constant, increasing the wavelength $\\lambda$ makes the frequency $f$ decrease.\n\nSo the first blank is **decreases**. This earns the first B1 mark.","highlig

The electromagnetic spectrum

Question 10

The electromagnetic spectrum Questions

The electromagnetic spectrum

Question 10

The electromagnetic spectrum Questions