Explain the significance of the Lyman Alpha Forest in studying the universe on the grandest of scales
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While the Lyman alpha line would normally be in the ultraviolet portion of the spectrum, for highly redshifted quasars, it is shifted into the visible, and then many more absorption lines, with lesser redshifts due to the gas clouds being closer to us, are observed against the background of the brilliant, distant quasar. We find that some heavy elements, like iron, show up quite early, suggesting that before the quasars existed, there was a first generation of massive stars making heavy elements.
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Resolution: Given perfect lenses, what is the main reason that a telescope with a large-diameter objective lens can produce a sharper image than one with a small-diameter lens?
A. A larger lens can gather more light than a smaller lens. B. A larger lens can focus more accurately than a smaller lens. C. There is less diffraction with a larger lens than with a smaller lens. D. A larger lens can focus more wavelengths of light than a smaller lens. E. A larger lens has a longer focal length than a smaller lens.
Uranus and Neptune appear bluish in color because:
A) methane gas in their atmospheres absorbs red light well. B) ammonia absorbs blue light well. C) hydrogen and helium are both blue in large concentrations. D) dust motes in their atmospheres scatter blue well, just as in our own blue sky. E) from their distance, the Sun would appear hotter and bluer than from Earth.
If a virtual image is formed 14.5 cm along the principal axis from a convex mirror of focal length –19.5 cm, how far is the object from the mirror?
a. 56.6 cm b. 14.5 cm c. 5.00 cm d. 20.0 cm e. 6.80 cm
If a watt is a unit of power, how can a kilowatthour be a measure of energy? Explain
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