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Compression: particles are closer together.
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Sound waves are longitudinal.
Electromagnetic waves are transverse.

","mcqOptions":null},{"id":"1446c8cb-020c-4258-a4db-34bee6e56e4c","cardType":"basic","points":1,"front":"How is the direction of wave travel related to wavefronts?","back":"It is perpendicular to the wavefronts.","mcqOptions":null},{"id":"002747f1-1064-4c8c-85ee-8e1f24ae83ed","cardType":"cloze","points":null,"front":"Frequency and period are reciprocals: $\\text{[...]}$.","back":"Frequency and period are reciprocals: $\\boxed{f=\\dfrac{1}{T}}$.","mcqOptions":null},{"id":"6fd5b656-0f31-4cb8-9fcb-2238f3a8eae6","cardType":"basic","points":2,"front":"A wave has a period of $0.0040\\ \\text{s}$. What is its frequency?","back":"$250\\ \\text{Hz}$","mcqOptions":null},{"id":"6d23172f-60c1-4b36-a8fe-653b6579385c","cardType":"cloze","points":null,"front":"Wave speed is calculated using $\\text{[...]}$.","back":"Wave speed is calculated using $\\boxed{v=f\\lambda}$.","mcqOptions":null},{"id":"07485e6d-38b1-4c14-bc28-c90d0b93f9ca","cardType":"basic","points":2,"front":"A wave has frequency $8.0\\ \\text{Hz}$ and wavelength $0.75\\ \\text{m}$. Calculate its speed.","back":"$6.0\\ \\text{m/s}$","mcqOptions":null},{"id":"0e55c515-244b-44d8-be55-114b7237ad17","cardType":"basic","points":2,"front":"What happens to wavelength if frequency doubles at constant wave speed?","back":"The wavelength halves.","mcqOptions":null},{"id":"e40c883f-e1bd-4c41-aea2-8c451dd1aef3","cardType":"basic","points":2,"front":"Why are two microphones and electronic timing suitable for measuring sound speed?","back":"They measure the delay without human reaction-time error.","mcqOptions":null},{"id":"52d003af-a9f1-4099-95c9-98bef7f2a282","cardType":"basic","points":2,"front":"Why measure across several wavelengths and divide by their number?","back":"It reduces percentage uncertainty in the wavelength.","mcqOptions":null},{"id":"c3962e15-cd67-478f-89ab-8a3491ffbbbd","cardType":"basic","points":2,"front":"In a solid, adjacent nodes are $0.30\\ \\text{m}$ apart. What is the wavelength?","back":"$0.60\\ \\text{m}$ because node spacing is $\\dfrac{\\lambda}{2}$.","mcqOptions":null},{"id":"ef9ec504-3156-4043-baf8-fcf804fd1e30","cardType":"basic","points":3,"front":"A wave enters another medium and its speed decreases. What happens to its frequency and wavelength?","back":"

Frequency stays constant.
Wavelength decreases in the same ratio as speed.

","mcqOptions":null},{"id":"752cef0e-dda8-4e38-b32a-f329143db18c","cardType":"cloze","points":null,"front":"For a returning echo measured over total time $t$, one-way depth is $\\text{[...]}$.","back":"For a returning echo measured over total time $t$, one-way depth is $\\boxed{d=\\dfrac{vt}{2}}$.","mcqOptions":null},{"id":"c178f783-d949-4ca1-85aa-bc15f4039a5d","cardType":"basic","points":2,"front":"A sonar pulse travels at $1500\\ \\text{m/s}$ and returns after $0.16\\ \\text{s}$. Find the depth.","back":"$120\\ \\text{m}$","mcqOptions":null},{"id":"dd8be3c9-39d0-414a-899f-32673eafd8f3","cardType":"basic","points":1,"front":"When should echo distance not be divided by two?","back":"When the stated time is explicitly one-way.","mcqOptions":null},{"id":"9f12a6b6-53a2-494f-82a1-7873a3ed200d","cardType":"cloze","points":null,"front":"From $d=\\dfrac{vt}{2}$, the echo time is $\\text{[...]}$.","back":"From $d=\\dfrac{vt}{2}$, the echo time is $\\boxed{t=\\dfrac{2d}{v}}$.","mcqOptions":null}]}],"examCountdown":{"examDate":"2027-05-25","paperLabel":"Paper 1"},"heading":"4.1 Wave properties","title":"4.1 Wave properties Flashcards","topbar":{"backHref":"/gcse/physics/edexcel/flashcards"},"topicSidebar":"$L37"}]}],"topicId":"7eb5853c-f857-59bf-a4fa-87107468b2a3","walled":"$L38"}],"$L39","$L3a"]