•Q1 As a star runs out of hydrogen in its core, as
seen from the OUTSIDE b.becomes cooler and more luminous.
•Q 2 White dwarfs do not shrink with time
because
a.degenerate electron pressure does not depend upon temperature.
•***Q 3 Formation of the elements heavier than
Fe occured primarily
c.by the r and s process
of neutron capture.
• Q4
The Ring Nebulae has an angular diameter of 72 arcseconds, and we estimate it is 5000 light years
away. The linear
diameter is c. 1.7 light
years
•Q 5 The catastrophic explosion of a star which
occurs when its degenerate
core grows larger than 1.4 solar masses is called a b.supernova
•Q 6 We see the Crab Nebula is about 1.35
parsecs in radius and is
expanding at a rate of 1400 km/s. Estimate when would the supernova have exploded? d. 920 years ago.
• Q7
Which of the below sequences shows objects with increasing densities?
b.Red Giant -- White Dwarf -- Neutron
Star -- Black Hole