What is a vibration?
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What is a longitudinal wave?
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{"type":"multi-choice","id":"2938","dataJson":{"type":"multi-choice","slide_id":15607,"key":2938,"prompt":"\u003cp\u003eWhat is a longitudinal wave?\u003c/p\u003e","validResponse":[3153],"use_data":false,"question_body":"","question_video_url":"","question_fileboy_image_id":"","options":[{"label":"a material through which waves can travel","value":3151,"fileboyId":"b751e2ec-54f7-4625-b4dd-d67f9e6c44e6"},{"label":"moves back and forth","value":3155,"fileboyId":"dfff811e-25da-41c9-8994-1bf744953ee8"},{"label":"movement back and forth in rhythm","value":3152,"fileboyId":"5a34274b-d424-4cdc-b23d-cfd530ad3bd0"},{"label":"the reflection of a sound wave; often creating the effect of the sound repeating","value":3154,"fileboyId":"a155ce4d-a611-4017-835e-04d7641da7ff"},{"label":"a wave that oscillates parallel to the direction of propagation","value":3153,"fileboyId":"7ed680b2-a69b-44bd-89a3-eed453a5e935"}],"question_data":{"body":"A longitudinal wave is comprised of compressions and rarefactions. A compression is where particles are moved close together, and a rarefaction is where they move apart.\n","video":null,"image_url":"https://www.developingexperts.com/file-cdn/images/get/5378a34d-21ba-4332-811d-6f3a72a5228f?transform=resize:800x600;format:webp;quality:80"},"limitChoices":{"min":1,"max":1}}}
What is an echo?
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{"type":"multi-choice","id":"2939","dataJson":{"type":"multi-choice","slide_id":15609,"key":2939,"prompt":"\u003cp\u003eWhat is an echo?\u003c/p\u003e","validResponse":[3154],"use_data":false,"question_body":"","question_video_url":"","question_fileboy_image_id":"","options":[{"label":"movement back and forth in rhythm","value":3152,"fileboyId":"5a34274b-d424-4cdc-b23d-cfd530ad3bd0"},{"label":"the reflection of a sound wave; often creating the effect of the sound repeating","value":3154,"fileboyId":"a155ce4d-a611-4017-835e-04d7641da7ff"},{"label":"a material through which waves can travel","value":3151,"fileboyId":"b751e2ec-54f7-4625-b4dd-d67f9e6c44e6"},{"label":"a wave that oscillates parallel to the direction of propagation","value":3153,"fileboyId":"7ed680b2-a69b-44bd-89a3-eed453a5e935"},{"label":"moves back and forth","value":3155,"fileboyId":"dfff811e-25da-41c9-8994-1bf744953ee8"}],"question_data":{"body":"Sometimes sound waves reflect off surfaces, causing the sound to bounce back. When this happens, you can hear the sound twice. What is a sound wave that bounces back called?","video":null,"image_url":"https://www.developingexperts.com/file-cdn/images/get/24ad5196-d7da-4f13-ae7a-9b48c18d9469?transform=resize:800x600;format:webp;quality:80"},"limitChoices":{"min":1,"max":1}}}
What does oscillates mean?
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What is a medium?
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{"type":"multi-choice","id":"2936","dataJson":{"type":"multi-choice","slide_id":15602,"key":2936,"prompt":"\u003cp\u003eWhat is a medium?\u003c/p\u003e","validResponse":[3151],"use_data":false,"question_body":"","question_video_url":"","question_fileboy_image_id":"","options":[{"label":"a material through which waves can travel","value":3151,"fileboyId":"b751e2ec-54f7-4625-b4dd-d67f9e6c44e6"},{"label":"a wave that oscillates parallel to the direction of propagation","value":3153,"fileboyId":"7ed680b2-a69b-44bd-89a3-eed453a5e935"},{"label":"the reflection of a sound wave; often creating the effect of the sound repeating","value":3154,"fileboyId":"a155ce4d-a611-4017-835e-04d7641da7ff"},{"label":"movement back and forth in rhythm","value":3152,"fileboyId":"5a34274b-d424-4cdc-b23d-cfd530ad3bd0"},{"label":"moves back and forth","value":3155,"fileboyId":"dfff811e-25da-41c9-8994-1bf744953ee8"}],"question_data":{"body":"When sound travels through a medium, one particle vibrates and it collides with the next one. This causes that one to vibrate, which collides with the particle next to it, and so on. As space is a vacuum, there is no sound there. Why do astronauts communicate in space by touching helmets if their radios break?","video":null,"image_url":"https://www.developingexperts.com/file-cdn/images/get/4571b706-1177-4126-9cb4-b31b45e1f500?transform=resize:800x600;format:webp;quality:80"},"limitChoices":{"min":1,"max":1}}}
Look at the slide below to work out the answer.