PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
In an experiment, the experimental E–T4 graph for a certain surface lies well below the theoretical line expected for a perfect blackbody. Which of the following is the most plausible reason?
(a) Significant convective heat loss from the surface was mistakenly attributed to lower radiation, giving smaller E values
(b) The thermometer used indicated temperatures higher than the true values, so the plotted T4 values were too large
(c) A negative zero error in the radiometer reduced every recorded value of emissive power E
(d) The surface had an emissivity less than unity