Which of the following objects is not a close approximation of a thermal emitter?

Question

Quizplus · Accepted Answer

Hot, thin gas is not a close approximation of a thermal emitter because it is not dense enough to emit radiation in a continuous spectrum. It only emits specific wavelengths, leading to emission lines. In contrast, objects like planets, stars, filaments in light bulbs, and even humans all emit thermal radiation in a continuous spectrum.

Which of the Following Objects Is Not a Close Approximation