What elements account for these absorption lines seen?

AI Thread Summary
The discussion centers on the misunderstanding of absorption lines in spectral images. Participants clarify that the observed vertical lines are not absorption lines, which should appear as horizontal features at specific wavelengths. Instead, they suggest that the lines are likely artifacts from the spectrometer's optics. The importance of having a sharp image for accurate spectral analysis is emphasized, as blurriness can obscure true absorption features. The conversation concludes with an acknowledgment of the need for improved imaging to resolve the issue.
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Homework Statement
What elements account for these absorption lines seen?..
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I can't see any absorption lines at all. If you're thinking about the two big black vertical lines, they are not absorption lines, which would be horizontal (at a particular wavelength) in this picture, not cutting across the spectrum. They are probably something to do with the optics of the spectrometer.
 
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mjc123 said:
I can't see any absorption lines at all. If you're thinking about the two big black vertical lines, they are not absorption lines, which would be horizontal (at a particular wavelength) in this picture, not cutting across the spectrum. They are probably something to do with the optics of the spectrometer.
The first image is a continuous spectrum . The second image you believe is a continuous spectrum as well ? ...Where am I going wrong, the first image is pointed at candle flame the second is pointed at an arc flash ... wouldn’t there be absorption lines present in the second image ? What accounts for the thick darker regions? :/
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Please don't change your original post (except for minor corrections like typos); now my post seems to make no sense.

What thick darker regions? They both look like continuous spectra. Absorption lines would appear as narrow dark vertical lines. Possibly you haven't got a sharp image of your object, so the spectrum is blurred.
 
mjc123 said:
Please don't change your original post (except for minor corrections like typos); now my post seems to make no sense.

What thick darker regions? They both look like continuous spectra. Absorption lines would appear as narrow dark vertical lines. Possibly you haven't got a sharp image of your object, so the spectrum is blurred.
mjc123 said:
Please don't change your original post (except for minor corrections like typos); now my post seems to make no sense.

What thick darker regions? They both look like continuous spectra. Absorption lines would appear as narrow dark vertical lines. Possibly you haven't got a sharp image of your object, so the spectrum is blurred.

Okay noted sorry about that ! I think you’re right I need a better image . Thanks for the help !
 
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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