Practical Physics

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I

PRACTICAL PITTSICS
for degree students

(8. Sc. Pass, Honours and Engineering Students)
Dr. Giasuddin Ahmad.
B. Sc. Hons. M. Sc. (Dhaka), Ph. D. (Glasgow)
Professor, Department of Physics
Bangladesh University of
Engineering and Technology, Dhaka.

and

Md. Shahabuddin, M. Sc. M. ALibrarian, Bangladesh University of Engineering and Technologr, Dhaka.
Formerly of the Department of Physics.
Ahsanullah Engineering College and Bangladesh University
of Engineering and Technology, Dhaka.

FOURTH EDITION
ThoroughLg reuised bg
ProJ. Giasuddin Ahmad Ph. D.
Department of PhUsics, Bangtadesh Uniuersitg
oJ Engineering and" Technologg. Dhcrka

IrIAF.IZ BOOK CENTRE

CIIAPTER I. INTRODUCTION

PREFACE TO FIRST EDITION
The "Practic-al Physis5 for Degree Students" is designed to co\rer the syllabi of the B.Sc. Pass and Subsidiary and B. Scl@ngineering) examinations of the different Unlrrersities of pakistan. our long experience in teaching physics and conducting practical classes has acquainted us with the various difficulties=that the students face in performing experiments. In this textbook attempts have been made to guide the students so that they may proceed to

record data systematically and then correlate them to get the results. strbject mafter of the book has been presented in i'simple manner so that the students may independently perform the
experiments without the help of the teachers. At the end of each experiment relevent questions and their answers harre been
provided, thus clarilying the theoretical aspect of the experiment. lables are provided at the end of each eiperiment. Hor,vever, it should be remembered that they are purely suggestive and there is nothing special about any particular form of tl-bulation. Tables of physical constants and logarithmic and trigonometrical tables have been provided at the end of the book for ready reference.

In writlng this book we consulted different books on practical physics specially those by Watson. Worsnop and Flint, Allen and Moore, S Datta, K. G. Majumdar, Roy Choudhury, Ganguli, H. Singh, J Chatterjee and K. Din. Various theoretical books hive also been

ArL

1.1

Importance of laboratory work

I

Art.
Art.

1.2
1.3

Errors in measurements
Degree of accuracy in measurement

I

Art.
Art.
Art.

1.4
1.5
1.6

Drawing of graphs
Experimental guidelines
A few general instructions

We like to thank Professor K. M. Saha, M.Sc. Head of the
Department of Physics, E. P. University of Engineering and
Techonlogr, Dacca, for hts keen interest in the 6ook an? his constant encouragefirent and guidance. We also like to thank our

Art.

consulted.

colleagues Mr. T. Hossain. M. Si. and Mr. Asadullah Khan. M. Sc. for

their various helps rendered during the preparation of this book. We gratefully acknowledge the debt we owe to Mr. Nurul Momen. M. Sc. (Dac), M. A. (Columbia) for many valuable and constructive suggestions.

We also like to thank Mr. Hassan Zoberi of M/S. Zoberi and pearl

for his active co-operation in bringing out this book. Thanks are also due to Mr. Anwar Ali of the Department of physics rvho helped us in getting the manuscript typed within a short time.
The book has been hurried through the press and as such some printing mistakes might have crept in inspite of our best efforts. We shall -gratefully welcome any suggestion which may help to improve the book.

I

t2

II. GENERAL PROPERTIES OF MATTPR
The slide callipers
To measure the length of a rod with a
vernier callipers.
The screw gauge
To measure the diameter of a piece of
wire with a screw gauge and to find its

13

average cross-section

20
23

Art.

2.1

Expt.

l.

ArL

2.2

Expt.

2.

AIL
Expt.

2.3

Art-

The balance
Travellins microscoDe

Art"

2.4
2.5
2.6

Expt.

4.

To weigh a body by the method of

Expt.

5.

Expt.

6.

Expt.

7.

Expt.

8.

To draw a graph...
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