Consider two future observatories in space:
Observatory A consists of a single 50-meter telescope.
Observatory B is an interferometer consisting of five 10-meter telescopes, spread out over a region 100 meters across.
Which observatory can detect dimmer stars, and which one can see more detail in its images? (Assume all else is equal, such as quality of optics, types of instruments, and so on.)
A) Observatory A can detect dimmer stars, and Observatory B reveals more detail in images.
B) Observatory B can detect dimmer stars, and Observatory A reveals more detail in images.
C) Observatory A both detects dimmer stars and reveals more detail in images.
D) Observatory B both detects dimmer stars and reveals more detail in images.
E) Both observatories have the same capabilities, but Observatory B would be cheaper to build.
A) Observatory A can detect dimmer stars, and Observatory B reveals more detail in images.
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A 1-pound ball and a 100-pound ball are dropped from a height of 10 feet at the same time. In the absence of air resistance
a. the 100-pound ball hits the ground first b. There's not enough information to determine which ball hits the ground first c. the 1-pound ball hits the ground d. first the two balls end in a tie
What happens when the electron in a hydrogen atom flips its direction of spin, from parallel to anti parallel to that of the proton?
A. Nothing, this transition never occurs. B. The atom emits high-energy ultraviolet rays. C. The atom emits 656-nm radiation that gives red color. D. The atom emits 21-cm radio radiation.
Which of the following could NOT be the result of scattering?
A. A star appears redder than it is. B. A nebula appears bluer than it is. C. A star appears dimmer than it is. D. The sky appears blue. E. None of these choices are correct.
An 82-kg painter stands on a long horizontal board 1.55 m from one end. This 27-kg board is uniform, 5.5 m long, and supported at each end by vertical posts
(a) What is the magnitude of the total force provided by both posts? (b) With what force does the post that is closest to the painter push upward on the board?