When the chromosphere can be seen during a solar eclipse, it appears:
A) invisible.
B) violet.
C) blue.
D) yellow.
E) red.
Question 2
When we see X-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system.
Which one would force us to immediately rule out the possibility of a black hole? A) bright X-ray emission that varies on a time scale of a few hours
B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths
C) sudden, intense X-ray bursts
D) visible and ultraviolet light from the companion star