Heat Transfer SBT QNO 13 Sol | Black Body Radiation | Emissivity | JEE / NEET
Автор: Physics Solutions
Загружено: 2025-11-25
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Heat Transfer SBT QNO 13 Sol | Black Body Radiation | Emissivity | JEE / NEET
In this video, we solve Question 13 from S.B.T., involving a copper sphere maintained at 500 K by connecting it to a voltage source. When half of its surface is blackened, the required voltage changes, and we use this information to calculate the emissivity of copper using Stefan–Boltzmann Law.
We break down the physics step-by-step, covering:
What is emissivity
What is emissive power
How Stefan’s Law applies to real surfaces
How blackening part of a surface changes radiative heat loss
How the change in EMF leads to the emissivity value
Perfect for Class XI/XII students, JEE/NEET aspirants, and anyone revising heat transfer concepts!
#physics #heattransfers #sbtsolutions #sbtphysics #PhysicsProblems #jeephysics #neetphysics #sbt #jeemains2026 #blackbody
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