The earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax
How many kilometers is this star from Earth?
A) 1.2 × 1017 km B) 1.2 × 1014 km C) 1.2 × 1020 km D) 1.2 × 1011 km
B
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In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is
a. composed of clouds of gas and stars moving at very high orbital velocities near a supermassive black hole. b. composed of a super massive black hole surrounded with empty space c. responsible for producing the bright continuous radiation from within the event horizon. d. responsible for the narrow absorption lines seen in Type 2 Seyfert galaxies. e. located far from the core beyond the disk of stars of the galaxy
Astronomers have defined a(n) _______________ around a star as a region within which planets that orbit there have temperatures permitting the existence of liquid water
Fill in the blank(s) with correct word
In order for two waves to interfere completely destructively, they must
a. have the same amplitude. b. be exactly out of phase. c. one wave's peak must align with the other's valley. d. be transverse waves. e. all of the above
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs glow equally brightly.
d.
bulb 1 goes out.
e.
bulb 2 goes out.