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GATE CH 2023 | Question-20

Q.30 & $\begin{array}{l}\text { Given that } E \text { (in } \mathrm{W} \cdot \mathrm{m}^{-2} \text { ) is the total hemispherical emissive power of a surface } \\
\text { maintained at a certain temperature, which of the following statements is/are } \\
\text { CORRECT? }\end{array}$ \\

  1. & $E$ does not depend on the direction of the emission. \\
  2. & $E$ depends on the viewfactor. \\
  3. & $E$ depends on the wavelength of the emission. \\
  4. & $E$ does not depend on the frequency of the emission. \\
    \hline &
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