Title Active PHYSICS DSE Level-up Companion 1.pdf ✅

✐ ✐ “DSE‐Companion” — 2020/5/29 — 8:38 — page 1 — #1 ✐ ✐ ✐ ✐ ✐ ✐ Answers and up-to-date information can be found at http://physics.pearson.com.hk. Contents Task 1A Calibration 2 Task 1B Additional chapter-end questions 6 Task 2A DSE measured value problems 9 Task 2B Additional chapter-end questions 14 Task 3A Understanding heating curves 18 Task 3B Additional chapter-end questions 22 Task 4A DSE gas problems 26 Task 4B Additional chapter-end questions 32 For inspection © United Prime Educational Publishing (HK) Limited, Pearson Education Asia Limited 2023 All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publishers.
✐ ✐ “DSE‐Companion” — 2020/5/29 — 8:38 — page 2 — #2 ✐ ✐ ✐ ✐ ✐ ✐ VTo be used with Textbook Before reading Ch. 1.1C Calibrating a thermometer (p. 9) VBased on DSE results and Report comments 2015-1B Q1, 2013-1B Q2, Practice Paper-1A Q1 Level-up Task 1A Calibration Many substances show observable changes when temperature varies. We can make use of them to measure temperature. This process is called calibration. Let’s learn it through the following questions. 1. Glowing iron piece A piece of iron does not glow at room temperature. When it gets hot, iron starts glowing red, orange, yellow, and then white. The table ▹ See Fig. 1.3 on textbook Ch. 1 below shows its approximate temperature when it glows with different p. 5. colours. colour temperature / ◦C black red (just visible) 500 dark red 700 cherry red 850 orange 1000 yellow 1200 white 1400 (a) When a piece of iron glows yellow, what is its approximate temperature? (b) If the iron is heated to 850 ◦C, what will be its colour? For inspection © United Prime Educational Publishing (HK) Limited, Pearson Education Asia Limited 2023 All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publishers.
✐ ✐ “DSE‐Companion” — 2020/5/29 — 8:38 — page 3 — #3 ✐ ✐ ✐ ✐ ✐ ✐ Level-up Task 1A Calibration 3 (c) When the iron does not glow, what can you say about its temperature? 2. Metallic resistance thermometer The resistance of a metal wire also changes with temperature. Compared to glowing iron pieces, it can measure temperature more precisely since the exact value of its resistance can be found using meters. The graph below shows how the resistance R of a wire changes with temperature T . The graph is called the calibration curve. (a) When the resistance of the wire is 20 Ω, what is its temperature? (b) When the resistance of the wire is 33 Ω, what is its temperature? For inspection © United Prime Educational Publishing (HK) Limited, Pearson Education Asia Limited 2023 All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publishers.