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NEET 2019
Exam
NEET
Year
2019
Subject
Physics
Chapter
Units and Dimensions

NEET 2019 · Physics · Units and Dimensions

The unit of thermal conductivity is

The unit of thermal conductivity is

Options

  1. AJmK−1Jm{K}^{- 1}
  2. BJm−1K−1J{m}^{- 1}{K}^{- 1}
  3. CWmK−1Wm{K}^{- 1}
  4. DWm−1K−1W{m}^{- 1}{K}^{- 1}

Correct answer

D. Wm−1K−1W{m}^{- 1}{K}^{- 1}

Step-by-step solution

∆Q∆t=KA∆T∆l\dfrac{\text{∆}Q}{\text{∆}t} = KA\dfrac{\text{∆}T}{\text{∆}l}
K=∆Q∆t∆l∆T1AK = \dfrac{\text{∆}Q}{\text{∆}t}\dfrac{\text{∆}l}{\text{∆}T}\dfrac{1}{A}
∴∴ Unit of KK is Wm−1K−1W{m}^{- 1}{K}^{- 1}
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