The focal length of the lens of a simple film camera is 40.0 mm. By what amount should the distance between the lens and the film be increased or decreased to change the focus from a person
who is 25 m from the lens to one who is 4.0 m from the lens?
A) 0.2 mm
B) 0.3 mm
C) 0.4 mm
D) 0.5 mm
E) 0.7 mm
B
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The approximate main-sequence lifetime of a star of spectral type O is
A) 3 million years. B) 10,000 years. C) 300 million years. D) 10 billion years.
A plot of the continuous spectra of five different stars is shown in Figure 6-1. Based on these spectra, which of the stars has the lowest temperature?
What is the significance of the Planck time?
A) It is the amount of time required for two protons to fuse to make deuterium. B) It is the time at which inflation is thought to have occurred. C) It is the time when the cosmic microwave background was released. D) Before it, conditions were so extreme that our current understanding of physics is insufficient to predict what might have occurred.
Rank the following 4 items by how long it takes for light to reach us from these objects, from shortest to longest
A) Pluto, Sun, the Andromeda Galaxy, center of the Milky Way B) Sun, Pluto, center of the Milky Way, the Andromeda Galaxy C) the Andromeda Galaxy, the center of the Milky Way, Pluto, Sun D) Pluto, Sun, center of Milky Way, the Andromeda Galaxy E) Sun, Pluto, the Andromeda Galaxy, center of the Milky Way