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ICAR JRF Agricultural Physics 29 Jun 2024Shift 1
MCQ (Single Correct) +4 −1
Which radiometric unit measures the total power emitted by a source per unit solid angle?
  • Radiometric Units in Physics:
  • Radiant Intensity ($I$): The radiant power (flux) emitted, reflected, or transmitted by a source per unit solid angle in a given direction:
$$I = \frac{d\Phi}{d\Omega} \quad (\text{Watts per steradian, } W/sr)$$
  • Radiant flux is total power ($W$), and radiant emittance is flux emitted per unit surface area ($W/m^2$). (Correct answer: Option 2)
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