---
title: Thunder, sirens and how fast sound travels — the lesson's questions with trees and pragmatics · Physics
description: The 15 test and exam questions of lesson 18 «Thunder, sirens and how fast sound travels» of the physics course of Mova's primary school, each with its options, Mova's choice and the right answer, every sentence with its dependency tree and pragmatics.
---

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# Thunder, sirens and how fast sound travels

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The 15 questions of lesson 18 «Thunder, sirens and how fast sound travels» of the physics course of Mova's primary school with their options, 81 sentences, every one parsed by Mova with its syntax tree and pragmatics. How the student did on them: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/physics/18-thunder-sirens-and-how-fast-sound-travels/).

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- [t1](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t1/) — no worries, thunder's like 20 seconds after the flash, storm's miles off yeah? — wrong ✗ · ★
- [t2](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t2/) — A cartoon shows thunder and lightning arriving together, even from far away. What is wrong? — wrong ✗ · ★
- [t3](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t3/) — Why is putting your ear to a railway line a terrible idea in real life? — right ✓ · ★
- [t4](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t4/) — A police car drives past you at speed. Which is true about its siren? — wrong ✗ · ★
- [t5](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t5/) — Why do foxes and rabbits have big ears that turn? — right ✓ · ★
- [t6](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t6/) — ugh my voice on the video sounds well weird, is the phone broken? — right ✓ · ★
- [t7](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t7/) — What would a stretched-out slack string do to your string telephone? — right ✓ · ★
- [t8](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t8/) — A whip makes a sharp crack. What is happening at its tip? — right ✓ · ★
- [t9](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t9/) — The same whisper is heard on the far side of a round gallery but not across a square hall. Why? — wrong ✗ · ★
- [t10](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t10/) — Which is true about sound and light? — wrong ✗ · ★
- [t11](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t11/) — Astronomers use the same squashed and stretched waves with light from stars. What can they learn? — right ✓ · ★
- [e1](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/e1/) — Identify the principal reason for which thunder is perceived subsequent to the corresponding flash of lightning. — wrong ✗ · exam
- [e2](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/e2/) — It is given that an interval of nine seconds elapses between a flash and the ensuing thunder. Ascertain the approximate distance of the discharge. — wrong ✗ · exam
- [e3](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/e3/) — Which of the following statements most accurately characterises the alteration of the pitch of a passing siren? — right ✓ · exam
- [e4](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/e4/) — State the anticipated consequence of prolonged exposure to sound of excessive intensity. — right ✓ · exam

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