Which of the following has the largest luminosity?
A: coolest Main Sequence star
B: Main Sequence star with the smallest radius
C: Main Sequence star with spectral type K
D: most massive Main Sequence star
E: the Sun
Ans: D: most massive Main Sequence star
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Which of the following telescopes would benefit most from adaptive optics?
A) The Keck I Telescope on Mauna Kea. B) The Hubble Space Telescope. C) The Arecibo Radio Telescope in Puerto Rico. D) The Chandra X-Ray Observatory.
What happens when a star exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It contracts, becoming smaller and dimmer. C) It contracts, becoming hotter and brighter. D) It expands, becoming bigger but dimmer. E) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness.
What difference to resource lifetimes does the state of the economy make? Explain
What will be an ideal response?
Consider an RLC series circuit. The impedance of the circuit increases if XC increases
A) true only if XL is greater than or equal to XC B) true only if XL is less than or equal to XC C) always true D) never true