The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an absorption spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
C
You might also like to view...
The primary evidence for an accelerating Universe comes from observations of young stars in the Milky Way.
A.) True, observations show that there were many more young, massive stars in the early Universe. B.) True, massive star supernovae allow us to measure the expansion rate of the Universe. C.) False, in order to measure accelerating expansion, we need to measure the distances of objects billions of light-years away. D.) False, evidence for an accelerating Universe comes from observations of the oldest stars in the Milky Way, white dwarfs. E.) False, we have to look at young stars in other galaxies beyond the Milky Way to measure the acceleration of the Universe.
The planet Neptune is, on average, about 4.5 billion km from the sun. How long does it take light from the sun to reach Neptune? (Recall that the speed of light is about 300,000 km/s)
A) about 4 days B) about 4 hours C) about 4 seconds D) about 4 minutes
A convex mirror has a focal length of magnitude f. An object is placed in front of this mirror at a point f from the face of the mirror. The image will appear
A) behind the mirror. B) upright and reduced. C) upright and enlarged. D) inverted and reduced. E) inverted and enlarged.
Which quantity listed below is an integral quantity?
(A) Velocity (B) Pressure (C) Temperature (D) Mass