No object produces a perfect thermal radiation spectrum,but many objects produce close approximations.Which of the following would not produce a close approximation to a thermal radiation spectrum?
A)a hot,thin (low-density,nearly transparent)gas
B)a filament in a standard (incandescent)light bulb
C)a star
D)you

Question

Quizplus · Accepted Answer

A hot, thin gas would not produce a close approximation to a thermal radiation spectrum because it lacks the necessary density and opacity to produce a continuous spectrum. Instead, it would produce an emission line spectrum with only a few specific wavelengths of light being emitted.

No Object Produces a Perfect Thermal Radiation Spectrum,but Many Objects