lling 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.","highlights":[{"text":"As the wavelength of an electromagnetic wave increases, its frequency __________","location":"specification"}]},{"type":"text","order":2,"title":"Complete the sentence","content":"In a vacuum, all electromagnetic waves travel at the same speed, so the second blank is **stays the same**. This earns the second B1.\n\nThe completed sentence is: *As the wavelength of an electromagnetic wave increases, its frequency **decreases** and its speed **stays the same**.*","highlights":[{"text":"its speed __________","location":"specification"}]}]}],"generatedAt":"2026-07-21T18:22:10.205Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"cba442aa-5297-4804-bcfe-f31cbe0bcc0b","label":"c","content":"The figure below shows how the intensity of the star's radiation changes with wavelength.\n\n![S

	Electromagnetic wave	Energy transfer
A	Microwaves	From a microwave transmitter to water molecules in food
B	Ultraviolet	From a person's skin to the Sun
C	Visible light	From a camera's digital sensor to a flashlight bulb
D	Radio waves	From a radio receiver to a broadcasting antenna

The electromagnetic spectrum

Question 8

The electromagnetic spectrum Questions

The electromagnetic spectrum

Question 8

The electromagnetic spectrum Questions