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# Fundamentals of Physics Chapter 20 Solutions: Entropy and the Second Law of Thermodynamics

Halliday Resnick & Walker Fundamentals of Physics Volume 1 Solutions for Chapter 20 ‘Entropy and the Second Law of Thermodynamics’ are prepared for NEET and IIT JEE Physics preparation. The chapter ‘Entropy and the Second Law of Thermodynamics’ of Resnick Halliday Physics Solutions discusses many processes that are irreversible. For example, an egg dropped onto a floor, a pizza is baked, large waves erode a sandy beach, etc. This chapter also guides you on why the time has direction and why one-way processes are irreversible.

Resnick Halliday and Walker fundamental of Physics Volume 1 ‘Entropy and the Second Law of Thermodynamics’ solutions around 5 modules and 79 questions of the chapter. These questions are of various difficulty levels. By solving these questions, you will be able to understand different topics such as irreversible processes and entropy, change in entropy, the second law of thermodynamics, entropy in the real world of the engine, refrigerators and real engines. All these questions are designed in a manner that you can prepare for the competitive exams effectively.

Resnick Halliday and Walker Physics Volume 1 ‘Entropy and the Second Law of Thermodynamics’ Solutions for JEE are provided to you in an elaborate manner so that you can understand all the tips and tricks to effectively solve each question. The subject matter experts at Instasolv have done extensive research before providing an answer to the questions. Thus, if you face issues on any particular topic of the chapter just refer to these solutions and solve your doubts quickly.

## Important Topics for Halliday Resnick & Walker Fundamentals of Physics Volume 1 Solutions Chapter 20: Entropy and The Second Law of Thermodynamics

One way Processes

One way process is also known as an irreversible process that cannot be reversed by the means of small changes in the environment. The change in entropy sets the direction in which an irreversible process proceeds. In the chapter, you will know different concepts about how and under what conditions does the entropy of the system increases or decreases.

Calculating Entropy Change

In this section, you will know how to calculate the amount of entropy change that takes place in an irreversible process.

The Second Law of Thermodynamics

In this law, you will know that, whenever a process occurs in the closed system, there is an increase in the entropy of the system for all the irreversible processes and also remains constant for all the reversible processes. There is never a decrease in entropy.

Engines

An engine is a device that operates in a cycle, extracts energy in the form of heat from the high-temperature reservoirs, and eventually do a certain amount of work. In the chapter, you will know how to calculate the efficiency of any engine.

A perfect engine is imaginary when the energy extracted in the form of heat from the high-temperature reservoir converts entirely to work. Such types of engine, easily violate the second law of thermodynamics.

Refrigerators

A refrigerator is a device that operates in a cycle and does work on it as it extracts energy in the form of heat from the low-temperature reservoir. In the chapter, you will know about the Carnot refrigerator.

Entropy from a statistical view

The entropy of a system can be defined in the terms of the possible distribution of its molecules. For identical molecules, each possible distribution of molecules is called a microstate of the system. All equivalent microstates are grouped into a configuration of the system.

### Exercise Discussion of Halliday Resnick and Walker Fundamentals of Physics Volume 1 Solutions Chapter 20: Entropy and The Second Law of Thermodynamics

Module 1: Entropy

This module has 22 questions where you need to find the work done by gas, finding the entropy change in gas, the number of moles of gas, absorbed energy, and the change in entropy.

Module 2: Entropy in the Real World: Engines

The module contains 12 questions. In the questions, you will find the right answers to how much temperature is increased or decreased, the efficiency of energy, calculating the amount of work done or the efficiency of energy, or finding the type of gas if it is monatomic, diatomic and polyatomic.

Module 3: Refrigerators and Real Engines

This module has 9 questions. In the questions, you will find the total amount of work done, the rate at which work is done, the amount of energy transferred, the amount of energy that is delivered at a particular rate.

Module 4: A Statistical View of Entropy

This module contains only 3 questions in which you need to find the configuration of the gas molecules that are equally divided in a box.