D C Pandey Arihant Understanding Physics for JEE Main and Advanced Waves and Thermodynamics 2020

464 Pages·2020·11.375 MB·English

by  D C Pandey

Understanding Physics
JEE Main & Advanced
WAVES AND
THERMODYNAMICS

Understanding Physics
JEE Main & Advanced
WAVES AND
THERMODYNAMICS
DC PANDEY
[B.Tech, M.Tech, Pantnagar, ID 15722]
ARIHANT PRAKASHAN (Series), MEERUT
Understanding Physics
JEE Main & Advanced
ARIHANT PRAKASHAN (Series), MEERUT
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© SARITA PANDEY
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Understanding Physics
JEE Main & Advanced
PREFACE
The overwhelming response to the previous editions of this book
gives me an immense feeling of satisfaction and I take this an
opportunity to thank all the teachers and the whole student
community who have found this book really beneficial.
In the present scenario of ever-changing syllabus and the test
pattern of JEE Main & Advanced, the NEW EDITION of this
book is an effort to cater all the difficulties being faced by the
students during their preparation of JEE Main & Advanced. The
exercises in this book have been divided into two sections viz.,
JEE Main & Advanced. Almost all types and levels of questions
are included in this book. My aim is to present the students a
fully comprehensive textbook which will help and guide them for
all types of examinations. An attempt has been made to remove
all the printing errors that had crept in the previous editions. I
am extremely thankful to (Dr.)Mrs. Sarita Pandey, Mr. Anoop
Dhyani and Nisar Ahmad for their endless efforts during the
project.
Comments and criticism from readers will be highly appreciated
and incorporated in the subsequent editions.
DC Pandey
Understanding Physics
JEE Main & Advanced
CONTENTS
17. WAVE MOTION 1-50
17.1 Introduction
17.2 Classification of a Wave
17.3 Equation of a Travelling Wave
17.4 Sine Wave
17.5 Two Graphs in Sine Wave
17.6 Wave Speed
17.7 Energy in Wave Motion
18. SUPERPOSITION OF WAVES 51-98
18.1 Principle of Superposition
18.2 Resultant Amplitude and Intensity due to Coherent Sources
18.3 Interference
18.4 Standing Wave
18.5 Normal Modes of a String
18.6 Reflection and Transmission of a Wave
19. SOUND WAVES 99-170
19.1 Introduction
19.2 Displacement Wave, Pressure Wave and Density Wave
19.3 Speed of a Longitudinal Wave
19.4 Sound Waves in Gases
19.5 Sound Intensity
19.6 Interference in Sound Wave and Stationary Wave
19.7 Standing Longitudinal Waves in Organ Pipes
19.8 Beats
19.9 The Doppler’s Effect
Understanding Physics
JEE Main & Advanced
20. THERMOMETRY, THERMAL EXPANSION &
KINETIC THEORY OF GASES 171-236
20.1 Thermometers and The Celsius Temperature Scale
20.2 The Constant Volume Gas Thermometer and The Absolute Temperature Scale
20.3 Heat and Temperature
20.4 Thermal Expansion
20.5 Behaviour of Gases
20.6 Degree of Freedom
20.7 Internal Energy of an Ideal Gas
20.8 Law of Equipartition of Energy
20.9 Molar Heat Capacity
20.10 Kinetic Theory of Gases
21. LAWS OF THERMODYNAMICS 237-305
21.1 The First Law of Thermodynamics
21.2 Further Explanation of Three Terms Used in First Law
21.3 Different Thermodynamic Processes
21.4 Heat Engine and its Efficiency
21.5 Refrigerator
21.6 Zeroth Law of Thermodynamics
21.7 Second Law of Thermodynamics
22. CALORIMETRY & HEAT TRANSFER 307-352
22.1 Calorimetry
22.2 Heat Transfer
Hints & Solutions 353-434
JEE Main & Advanced
Previous Years' Questions (2018-13) 1-19
Understanding Physics
JEE Main & Advanced
SYLLABUS
JEE M ain
HEAT AND THERMODYNAMICS
Heat, temperature, thermal expansion; specific heat capacity, calorimetry;
change of state, latent heat. Heat transfer-conduction, convection and radiation,
Newton’s law of cooling.
Thermal equilibrium, Zeroth law of thermodynamics, concept of temperature.
Heat, work and internal energy. First law of thermodynamics. Second law of
thermodynamics: reversible and irreversible processes. Carnot engine and its
efficiency.
Equation of state of a perfect gas, work done on compressing a gas. Kinetic
theory of gases – assumptions, concept of pressure. Kinetic energy and
temperature: rms speed of gas molecules; Degrees of freedom, Law of
equipartition of energy, applications to specific heat capacities of gases; Mean
free path, Avogadro’s number.
WAVES
Wave motion. Longitudinal and transverse waves, speed of a wave.
Displacement relation for a progressive wave. Principle of superposition of
waves, reflection of waves, Standing waves in strings and organ pipes,
fundamental mode and harmonics, Beats, Doppler’s effect in sound.
Understanding Physics
JEE Main & Advanced
JEE A dvanced
GENERAL
Specific heat of a liquid using calorimeter. Speed of sound using
resonance column.
WAVES
Wave motion (plane waves only), longitudinal and transverse waves,
superposition of waves, Progressive and stationary waves, Vibration of
strings and air columns, Resonance, Beats, Speed of sound in gases,
Doppler’s effect (in sound).
HEAT and THERMODYNAMICS
Thermal expansion of solids, liquids and gases, calorimetry, latent heat,
Heat conduction in one dimension, Elementary concepts of convection
and radiation, Newton’s law of cooling, Ideal gas laws, Specific heats
(and for monoatomic and diatomic gases), Isothermal and adiabatic
processes, bulk modulus of gases, Equivalence of heat and work, First
law of thermodynamics and its applications (only for ideal gases), Black
body radiation: absorptive and emissive powers, Kirchhoff’s law, Wien’s
displacement law, Stefan’s law.