The critical angle is given by sinc (1/n1 ) for what condition?
What will be an ideal response?
The second index n2 =1.00
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Why are rapid fluctuations in an active galaxy's luminosity evidence for a supermassive black hole?
What will be an ideal response?
Mercury is still geologically active today
a. True b. False Indicate whether the statement is true or false
This figure shows an all-sky map of the cosmic microwave background recorded by the Planck mission. What do the dark and bright variations represent?
A) regions of the sky with very slightly different density at the time the radiation was emitted B) regions of the sky with different proportions of hydrogen and helium at the time the radiation was emitted C) the present distribution of galaxies in the universe D) regions of the sky with different amounts of dark energy
For a specific element, photons of how many different energies could be emitted by electrons in the n = 2 level as they return to the n = 1 level?
a. 3 b. 4 c. 2 d. 1