Master NEET Physics 2025: Thermodynamics First Law Solved Problem

Are you preparing for NEET 2025 and looking to master Thermodynamics? In this video, we break down a high-yield question based on the First Law of Thermodynamics, specifically focusing on the relationship between heat, internal energy, and work done in cylindrical systems.

What You Will Learn:

In this tutorial, we solve a specific problem involving two gases (A and B) in separate cylinders with movable pistons. You will learn how to:

• Apply the First Law of Thermodynamics formula: dQ = dU + dW [01:11].

• Understand how constant pressure and equal heat supply affect work done [01:26].

• Relate volume change to cylinder radius and displacement [02:01].

• Step-by-step calculation to find the ratio of radii when given displacement values [02:44].

Problem Breakdown:

The problem eXplores two systems where the heat energy supplied  and the change in internal energy  are identical. By isolating the work done , we demonstrate that the product of the cross-sectional area and the displacement remains constant. This leads us to the final ratio of for the radii given the displacements of and [02:58].