Exam Prep Third Edition More Power - Understanding Our Universe 3e Complete Test Bank by Stacy Palen. DOCX document preview.
Mission 16: More Power
MULTIPLE CHOICE
1. Which of the following numbers most closely approximates the radii of neutron stars with masses between 1.4 and 3.0 solar masses?
a. 5–15 km d. 1,000–10,000 km
b. 50–100 km e. 10,000–50,000 km
c. 100–1,000 km
2. For an object that is 1.5 million Kelvin, which of the following values best approximates the peak wavelength of its blackbody emission spectrum?
a. 0.2 nm d. 200 nm
b. 2.0 nm e. 2,000 nm
c. 20 nm
3. At a density of 1017 kg m–3, a teaspoon (5 cm3) of a neutron star is equivalent to how many kilograms?
a. 5 × 106 kg d. 5 × 1012 kg
b. 5 × 108 kg e. 5 × 1014 kg
c. 5 × 1010 kg
4. Globular clusters commonly contain upwards of
a. 1,000 stars. d. 1,000,000 stars.
b. 10,000 stars. e. 1,000,000,000 stars.
c. 100,000 stars.
5. Which of the following is not a characteristic of globular clusters?
a. Cluster stars have very little “metal” content.
b. Cluster stars are quite old.
c. Cluster diameters are on the order of 100 parsecs.
d. Clusters are dominated by low-mass stars.
e. Clusters orbit within the disk of the galaxy.
1. Globular clusters are found in the halos of the Milky Way and other galaxies. Given what we know about the lack of gas and dust in these regions and the resulting lack of star formation, what types of stars can we expect to find in globular clusters?
2. Disk-like structures are observed in many phenomena through the Universe. For example, young stars are surrounded by protoplanetary disks, which form planets but also accrete material directly onto the young star. Active galactic nuclei also possess accretion disks that feed a central supermassive black hole. X-ray binary systems in which material is transferred on the compact object also form accretion disks. What is it about nature that makes these structures so common?