The ____________________ of a black hole in a binary system can emit X-rays and allow us to detect the presence of the black hole
Fill in the blank(s) with correct word
accretion disk
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Photon Energy: The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10-18 W. How many photons arrive each second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
A figure skater with arms initially extended starts spinning on the ice at 3 rad/s. She then pulls her arms in close to her body. Which of the following results?
a. a smaller rotational rate c. a greater angular momentum b. a greater rotational rate d. a smaller angular momentum
A(n)__________occurs when the Moon is at its greatest distance from Earth and the Moon is new
A) total solar eclipse B) partial lunar eclipse C) annular solar eclipse D) total lunar eclipse
When someone on Earth observes the Moon in the first-quarter phase, someone on the Moon facing Earth observes Earth in the
A) crescent Earth phase. B) third-quarter Earth phase. C) new Earth phase. D) first-quarter Earth phase. E) full Earth phase.