MCQ
The minimum temperature of a body at which it emits light is.......$^oC$
- A$1200$
- B$1000$
- ✓$500$
- D$200$
✓
Answer
Correct option: C.
$500$
c
A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic black-body radiation. From the Spectrum Plot of a blackbody with different temperatures, we can conclude that as the temperature increases past about $500^{\circ}\, C$, black bodies start to emit significant amounts of visible light viewed in the dark by the human eye.
A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic black-body radiation. From the Spectrum Plot of a blackbody with different temperatures, we can conclude that as the temperature increases past about $500^{\circ}\, C$, black bodies start to emit significant amounts of visible light viewed in the dark by the human eye.
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