Glow of emission lines vs. hot objects

AI Thread Summary
The discussion explores the differences between the glow of emission lines and the glow of hot objects. Emission lines are associated with specific atomic transitions, often explained by the Bohr model of the atom. In contrast, the glow of hot objects is primarily due to blackbody radiation, which emits a continuous spectrum of light. While both phenomena involve light emission, hot objects typically emit at multiple frequencies due to their composition of various elements. Heating substances like pure salt demonstrates this by producing distinct emission lines for sodium.
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"glow" of emission lines vs. hot objects

I was wondering how the mechanisms differ between the following two scenarios:

A. The glow of emission lines

(I think it has to do with the Bohr atom)

B. The glow of hot objects

(I think it has to do with Blackbody radiation)
 
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They are really pretty much the same. The difference is that "objects" are typically made of many different elements which "glow" at many different frequencies. If you heat, say, pure salt, you will see primarily the emission lines for sodium.
 
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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