--- title: Olympiad: sound, light, heat, electricity and magnets ★★★ — a lesson of Mova's school · trees and pragmatics description: «Olympiad: sound, light, heat, electricity and magnets ★★★», a lesson of the physics course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: This block mixes the wobbles, rays and flows of the course, sound, light, heat, electricity and magnets, into pu --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/) [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/) / [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/) / Olympiad: sound, light, heat, electric… # Olympiad: sound, light, heat, electricity and magnets ★★★ Lesson 43 of the physics 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/physics/43-olympiad-sound-light-heat-and-magnets/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/0/) — This block mixes the wobbles, rays and flows of the course, sound, light, heat, electricity and magnets, into puzzles where one sharp idea does all the work. - [1](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/1/) — Many puzzles hide a race: light arrives almost at once, while sound needs about three seconds for each kilometre, so the gap between the flash and the bang tells you how far away a storm is. - [2](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/2/) — Some puzzles hide a feeling that fools you: a metal railing feels colder than a wooden fence beside it, though both are at the same temperature, because metal draws heat out of your hand faster. - [3](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/3/) — Mirror puzzles need care: a word reads the same in a flat mirror only if it is spelt the same backwards and uses only letters that look the same flipped, such as A, H, I, M, O, T, U, V, W, X and Y. - [4](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/4/) — Picture Cerys in Cardiff in a storm: "It's chucking it down, mun, and the thunder's a million miles off": "chucking it down" means pouring with rain, "mun" means mate, and "a million miles" is hyperbole, so she should count the seconds instead. - [5](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/5/) — In air sound travels about one kilometre every three seconds, while light arrives almost instantly, so seconds divided by three gives the distance of a storm in kilometres. - [6](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/6/) — If the gaps between flash and thunder grow shorter, say 15, then 9, then 3 seconds, the storm is coming closer. - [7](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/7/) — TOOT, WOW and MOM read the same in a flat mirror, because they are spelt the same backwards and every letter looks the same flipped. - [8](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/8/) — A red apple under a blue lamp looks almost black, and a white T-shirt under a red lamp looks red, because white bounces back every colour that falls on it. - [9](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/9/) — Sunlight takes about eight minutes to reach the Earth, so if the Sun went out we would still see it shining for about eight minutes. - [10](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/10/) — Light crosses empty space but sound cannot, so astronauts see the Sun but never hear it, and talk to each other by radio. - [11](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/11/) — A drink with ice in it stays near 0 degrees until all the ice has melted, because melting takes in heat. - [12](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/12/) — Two batteries in a row pushing the same way push about twice as hard; if one is turned round, they push against each other and the bulb hardly lights. - [13](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/13/) — In a string of lights with all the bulbs in one loop, one broken bulb stops the flow to all of them. - [14](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/14/) — A magnet snapped in two becomes two magnets, each with its own north and south pole. - [15](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/15/) — Iron, steel, nickel and cobalt are pulled strongly by a magnet; aluminium, copper and gold are not. - [16](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/16/) — Steam is invisible: the white cloud above a kettle is tiny droplets, and the real steam is in the clear gap just above the spout. - [17](https://md.mova.elamur.ai/free/en/corpora/school/physics/43-olympiad-sound-light-heat-and-magnets/17/) — Dirty snow melts faster than clean snow in the Sun, because the dark dirt soaks up sunlight while white snow bounces it away. - ← previous: [Olympiad: forces, floating and machines ★★★](https://md.mova.elamur.ai/free/en/corpora/school/physics/42-olympiad-forces-floating-and-machines/) - next →: [Olympiad: speed, space and seasons ★★★](https://md.mova.elamur.ai/free/en/corpora/school/physics/44-olympiad-speed-space-and-seasons/) - ↑ back to [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/)