--- title: Sound — vibrations, loudness, pitch and echoes — a lesson of Mova's school · trees and pragmatics description: «Sound — vibrations, loudness, pitch and echoes», a lesson of the world course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Every sound is made by something vibrating — moving quickly back and forth. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/54-sound/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [World](https://md.mova.elamur.ai/free/en/corpora/school/world/) / Sound — vibrations, loudness, pitch an… # Sound — vibrations, loudness, pitch and echoes Lesson 54 of the world course of Mova's primary school: 18 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/world/54-sound/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/0/) — Every sound is made by something vibrating — moving quickly back and forth. - [1](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/1/) — Touch your throat while you hum and you can feel your voice box vibrating. - [2](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/2/) — The vibration shakes the air next to it, that air shakes the air next to it, and so the sound travels outward until it reaches our ears and makes the eardrum vibrate too. - [3](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/3/) — Sound needs something to travel through: air, water or solids such as wood and metal. - [4](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/4/) — In space there is no air, so there is no sound — astronauts talk by radio. - [5](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/5/) — A bigger vibration makes a louder sound; a faster vibration makes a higher sound. - [6](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/6/) — A short, tight guitar string vibrates fast and sounds high; a long, loose string vibrates slowly and sounds low. - [7](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/7/) — When sound hits a large hard surface, such as a cliff or a wall of an empty hall, it bounces back. - [8](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/8/) — The sound we hear coming back is called an echo. - [9](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/9/) — All sounds are made by vibrations. - [10](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/10/) — Sound travels through air, water and solids, but not through empty space. - [11](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/11/) — Sound travels faster through water and solids than through air. - [12](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/12/) — Bigger vibrations make louder sounds. - [14](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/14/) — Pitch means how high or low a sound is. - [15](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/15/) — Shorter, thinner or tighter strings make higher notes. - [16](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/16/) — An echo is a sound that bounces back from a hard surface. - [17](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/17/) — Soft materials such as curtains and carpets absorb sound and reduce echoes. - [18](https://md.mova.elamur.ai/free/en/corpora/school/world/54-sound/18/) — Sound gets quieter the further it travels from its source. - ← previous: [Light, shadows and colours](https://md.mova.elamur.ai/free/en/corpora/school/world/53-light/) - next →: [Electricity — circuits, switches and safety](https://md.mova.elamur.ai/free/en/corpora/school/world/55-electricity/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/corpora/school/world/)