The resolving power for light of 550 nm of an optical telescope with a diameter of 232 cm is
a. 0.05 arc seconds.
b. 232 arc seconds.
c. 2.32 arc seconds.
d. 5 arc seconds.
e. 11.6 arc seconds.
a
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A hydrogen atom is excited to the n = 10 stated. It then decays to the n = 4 state by emitting a photon which is detected in a photographic plate. What is the frequency of the detected photon?
The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 3.46 × 1014 Hz B) 0.865 × 1014 Hz C) 1.27 × 1014 Hz D) 4.05 × 1014 Hz E) 1.73 × 1014 Hz
Galaxies in all directions are observed to be streaming away from us as if we were in the center of the universe
Contrast this impression with the Cosmological Principle and explain why a simple-minded interpretation of the Hubble expansion is incorrect.
Long-term data on global carbon dioxide levels can be obtained from analyzing air trapped in
A) rocks B) ice cores drilled out of the Antarctic ice sheet C) the upper atmosphere D) deep ocean sediments
Where does the 21-cm radiation arise?
What will be an ideal response?