GRADE 12 PHYSICS

GR 12 PHYSICS U4

TITLE

DEPARTMENT OF EDUCATION

GRADE 12 PHYSICS

MODULE 3

WAVES

FLEXIBLE OPEN AND DISTANCE EDUCATION

PRIVATE MAIL BAG, P.O. WAIGANI, NCD

FOR DEPARTMENT OF EDUCATION

PAPUA NEW GUINEA

2016

0

GR 12 PHYS M3

TITLE

Writers:

Gideon Messa & Vincent Kapui

Editors:

Dr. Mirzi Betasolo

Elizabeth.W.Aimundi

1

GR 12 PHYSICS U4

TITLE

GRADE 12

PHYSICS

MODULE 3

WAVES

IN THIS MODULE, YOU WILL LEARN ABOUT:

2

12.3.1:

PROPERTIES OF WAVES

12.3.2:

SUPERPOSITION AND INTERFERENCE OF WAVES

12.3.3:

WAVES AND BOUNDARIES

12.3.4:

APPLICATION

GR 12 PHYS M3

ACKNOWLEDGEMENT

Acknowledgements

We acknowledge the contribution of all Lower and Upper Secondary Teachers

who in one way or another helped to develop this Course.

Special thanks are given to the staff of the Science Department- FODE who

played active role in coordinating writing workshops, outsourcing of module

writing and editing processes involving selected teachers in NCD.

We also acknowledge the professional guidance and services provided throughout the processes of writing by the members of:

Science Subject Review Committee-FODE

Academic Advisory Committee-FODE

Science Department- CDAD

This book was developed with the invaluable support and co-funding of the GOPNG and World Bank.

MR. DEMAS TONGOGO

Principal-FODE

.

Flexible Open and Distance Education

Papua New Guinea

Published in 2016

@ Copyright 2016, Department of Education

Papua New Guinea

All rights reserved. No part of this publication may be reproduced,

stored in a retrieval system, or transmitted in any form or by any

means electronic, mechanical, photocopying, recording or any

other form of reproduction by any process is allowed without the

prior permission of the publisher.

Printed by the Flexible, Open and Distance Education

ISBN 978-9980-89-561-5

National Library Services of Papua New Guinea

3

GR 12 PHYS M3

CONTENTS

TABLE OF CONTENTS

Page

Title¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­..........................................

ISBN and Acknowledgement¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­...

Contents¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­.¡­¡­..

Secretary¡¯s Message¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­.¡­¡­..

1

2

3

4

MODULE 12.3: WAVES

Course Introduction¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­..¡­¡­¡­¡­¡­¡­¡­¡­...¡­.¡­..

Learning Outcomes¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­..¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­

Time Frame¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.

5 - 75

5

6

7

12.3.1:

Properties of Waves¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­.¡­¡­¡­¡­..¡­.¡­¡­¡­¡­¡­¡­.¡­¡­.

Types of Waves¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­..¡­¡­¡­.

Wave Properties¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­.¡­¡­¡­..¡­.¡­¡­¡­...

8 - 28

10 - 18

19 - 28

12.3.2:

Superposition and Interference of Waves¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­...¡­¡­..¡­..

Superposition and Interference of Waves ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­.¡­¡­¡­

28 - 37

28 - 37

12.3.3:

Waves and Boundaries¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­..¡­¡­.¡­¡­¡­¡­¡­¡­.¡­. 38 - 60

Propagation of Waves at Boundaries¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­..¡­¡­¡­. 39 ¨C 60

12.3.4:

Application¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­.¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­.¡­.

Applications Involving Light Waves¡­¡­¡­..¡­.¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­..¡­¡­¡­.

Applications Involving Sound Waves ¡­¡­..¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­.¡­¡­¡­..¡­.¡­¡­...

60 - 63

60 - 65

66 - 72

Summary¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­..¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­ 73 - 75

Answers to Learning Activities¡­¡­¡­¡­¡­¡­¡­¡­¡­..¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­.. 76 - 82

References¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­..¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­ 83

4

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