Post-UTME Physics 2010 Objective — Question 4

Question 4 of 10 from the Post-UTME Screening (Post-UTME) Physics 2010 Objective paper, with the correct answer and a full explanation.

Which of the following colours of surfaces will radiate heat energy?

A. Red
B. White
C. Black
D. yellow

Explanation

The source key states 'White'; however, by standard physics (Kirchhoff's law of thermal radiation), black surfaces are actually the best absorbers and emitters of thermal radiation — this looks like a likely error in the original key.

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