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21. In a binary star system, the region around each star where gravitational force dominates is
called the:
A. Roche lobe.
B. light radius.
C. corotational radius.
D. synchrotron region.
22. When did the burst of neutrinos from SN1987A arrive?
A. One week after it became visible.
B. One week before it became visible.
C. Several hours before it became visible.
D. Three days after it became visible.
23. In beta decay, a neutron under normal conditions of low pressure will disintegrate in:
A. less than 10 minutes.
B. less than one minute.
C. more than one hour.
D. less than 10 nanoseconds.
24. During the burning of a Red Supergiant and during a Supernova explosion, nucleosynthesis
takes place. The process that synthesizes heavy elements is:
A. gravitational attraction.
B. bombardment of nuclei by high-energy neutrons.
C. bombardment of neutrons by neutrinos.
D. fission of iron into alpha particles.
25. The "rapid process" and "slow process" contribute to the buildup of heavy nuclei. If the neutron
capture rate is slower than the beta-decay rate, __________ are formed.
A. proton-rich nuclei
B. neutron-rich nuclei
C. electron-rich nuclei
D. less massive nuclei
26. In the Lighthouse Model of pulsar emission, the _________ may be due to polar emission of
photons and particles that are not exactly aligned with the observational direction.
A. primary pulse
B. major pulse
C. inter-pulse
D. secondary pulse
27. Which of these is a potential type I supernova?
A. A red giant transferring mass to a 1.3 solar mass white dwarf.
B. A red giant making silicon in its core.
C. The superhot central star of a planetary nebula.
D. A rapidly spinning neutron star.