One ______________ is the distance to a star when the star exhibits a parallax of one second of arc
a. parsec
b. light-year
c. astronomical unit
d. million miles
a
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RR Lyrae stars pulsate, but with shorter periods and lower luminosities than Cepheids
Indicate whether the statement is true or false
How can you identify an asteroid in a long exposure taken of stars through a telescope? (Assume the telescope is tracking the sky with Earth's rotation, so that stars appear as points of light.)
A) The asteroid will be much brighter than the surrounding stars. B) The asteroid will be much dimmer than the surrounding stars. C) The asteroid will appear as a streak because of its motion relative to the stars. D) The asteroid will have a noticeable circular disk, rather than being just a point of light like the stars. E) The asteroid will be recognizable by its long, fuzzy tail.
Many supernovas are thought to result in
A) neutron stars. B) regular stars like our sun. C) red giant stars. D) white dwarfs.
Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers
What sound intensity does the other student measure? Assume that the sound spreads out uniformly and undergoes no significant reflections or absorption. A) 6.2 × 10-8 W/m2 B) 1.5 × 10-7 W/m2 C) 8.3 × 10-8 W/m2 D) 7.8 × 10-7 W/m2 E) 2.5 × 10-8 W/m2