What type of spectrum does a heated rock emit?

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A heated rock emits a thermal radiation spectrum, also known as "black body" radiation, as it glows due to retained heat. This spectrum is characterized by a broad range of wavelengths rather than specific lines. The discussion also touches on the difference between thermal radiation and absorption/emission line spectra, with the latter resulting from specific physical mechanisms involving atomic transitions. For further understanding, a link to a Wikipedia article on black body radiation is provided. Overall, the consensus confirms that the glowing rock primarily emits thermal radiation.
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hi guys, i am having trouble with a problem. it's as goes:
if you heat a rock until it glows, its spectrum will be:
(a) a thermal radiation spectrum
(b) an absoprtion line spectrum
(c) an emission line spectrum

I think it's thermal radiation spectrum because it seems like the rock is retaining heat thus making it glow. but I'm not sure. can someon please help me. thanks.
 
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You are correct. It will be giving off broad spectrum "black body" thermal radiation.

Quiz Question -- what physical mechanism results in absorption and emission "line" spectra?
 
i don't really know. i just know thermal is heat and that's why the rock heats up.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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