X-ray bursters occur in binary star systems. The two types of stars that must be present to make up such an object are:
A) a white dwarf and a neutron star.
B) a contact binary system of two red giants.
C) a white dwarf and a main sequence star.
D) a main sequence or giant star and a neutron star in a mass transfer binary.
E) two neutron stars in a mass transfer binary.
D
You might also like to view...
Polarization: The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity at the observer is a maximum. What is the axis angle settings of polarizer B?
A. 0° B. 25° C. 50° D. 75° E. 100°
Which of the following is true of Population II stars?
A) They are located in the disk component of the galaxy. B) They have randomly tipped orbits with a wide range of shapes. C) They have higher metal content than Population I stars. D) They are post-main sequence stars.
Carnot Engine: An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at 1.76 K has an efficiency of 40.0%. What is the temperature of the warm reservoir?
A. 2.93 K B. 0.0500 K C. 106 K D. 0.0400 K
All minerals exhibit cleavage.
a. true b. false