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# DC Pandey Calorimetry & Heat Transfer Solutions

DC Pandey Waves and Thermodynamics Solutions for Chapter 19 ‘Calorimetry and Heat Transfer’ for Class 11 and Class 12 are the perfect study material for you. These solutions are created to provide you with assistance in solving the exercise questions of this chapter effortlessly. The topics included in this chapter of DC Pandey Physics are a detailed study of specific heat and its relation to the phase changes. In this chapter, you will also learn the role and application of latent heat and heat transfer in calorimetry.

You will get to solve 78 questions in various introductory exercises, JEE Main and JEE Advanced exercises in DC Pandey Calorimetry and Heat Transfer Chapter. All these questions are as per the latest Physics syllabus for Class 11 and 12. Solving these questions consistently will prepare you for your CBSE Class 12 board exams as well as the important entrance exams such as the Joint Entrance Exam, BITSAT, etc. You will get a good idea about the level of questions asked in these exams.

The Instasolv platform will assist you in solving the questions in the DC Pandey Waves and Thermodynamics book for Class 11 and Class 12 with a total conceptual understanding of the topics. The answers by the physics experts at Instasolv are written in such a manner that you will find appropriate reasoning in each step of all the answers. We use the simplest possible methods to solve the exercise questions to guide you in developing a strong foundation in waves and thermodynamics. Referring to our solutions will yield you good ranks in the exams of your choice.

## Important Topics for DC Pandey Waves and Thermodynamics Solutions Chapter 19: Calorimetry and Heat Transfer

Specific Heat

Specific Heat defines the relationship between the exchange of heat between the system and the surroundings and the corresponding change in temperature of the body. If we assume a mass m changes by an amount of ‘dt’ from T on an exchange of heat dQ, then it’s specific heat is

Therefore, Specific Heat can also be defined as the amount of heat required to increase the temperature of unit mass by 1 degree Celsius (or 1 Kelvin),

Now, Molar Heat Capacity,  can be defined as the energy needed to raise the temperature of whole or 1 mole of a substance by 1 degree Celsius.

Phase Changes

Whenever there is a change in the phase of substance, that is, from solid to liquid to gas, the temperature becomes constant while the phase change takes place upon adding heat. This happens because of the Latent Heat.

Latent Heat

The amount of heat that is needed to change the phase of a unit mass of the given substance is termed as Latent Heat and is denoted by L. The heat needed for the melting or vaporization of the substance is given as

Q=mL

When a solid melts into a liquid, Latent heat is termed as the latent heat of fusion denoted as Lf and when a liquid is converted into gas by adding heat is known as latent heat of vapourization, Lv.

Heat Transfer

Heat Transfer takes place through a medium with the processes of conduction and convection whereas, in case of radiation, a medium is not essential.

• Conduction: In the case of conduction, the heat transfer takes place with the help of free excited electrons. Heat current, H is the rate of heat transfer.  H is directly proportional to the cross-sectional area, A, and temperature gradient. Hence,

• Convection: In convection, heat transfer takes place with an actual flow of the fluid. The process is applicable only to fluids. Convection can either be natural or forced.
• Radiation: According to Stephan’s Law, the rate at which a substance radiates energy. The rate is proportional to the 4th power of its absolute temperature. Therefore, is Stephan’s constant and e is the emissivity.

### Exercise Discussion for DC Pandey Waves and Thermodynamics Solutions Chapter 19: Calorimetry and Heat Transfer

Introductory Exercises:

• In the introductory exercise 19.1, there are 5 questions based on the specific heat and molar heat capacity.
• The 7 questions in exercise 19.2 are based on the types of heat transfer that in turn include topics such as conduction, convection, and radiations. These exercises are ideal for Class 11 and Class 12 Physics exam preparation.

Exercise for JEE Main:

• There are 11 subjective questions in which you will be required to find the specific heat, the molar heat capacity of given situations. You will also get to practice questions of phases changes.
• There are 24 objective multiple-choice questions in this exercise including all the topics mentioned above besides covering the processes of heat transfer. In the later part of multiple-choice questions, you will also get the exercises with more than one option correct.