10 missed Q's Exam 3

According to Henrietta Swan Lequitt, the Cepehid variable stars obeyed a beautiful relationship that allows them to be used as a "standard candles" Which of the following qualitatively describes that relationship?

The longer the period the larger the luminosity

One possible explanation for the weird, beautiful and fantastic shapes of planetary nebula is that they...

Have a companion and there is a powerful magnetic field being created by the mass exchange process

The graph below shows the binding energy per nucleon for several atomic nuclei. Based on this future, which of the following is a fusion reaction that would release energy? (Graph with dip in top left then up and over)

Helium - 4 to Carbon - 12

When the Iron core of a high mass star collapses, which of the following occurs?

Protons and Electrons combine to form Neutrons

Sunspots are areas of?

intense magnetic fields

Why does stellar fusion of massive stars end with an iron core?

iron does not release energy when it undergoes fusion

What force can stop the gravitational collapse of the most massive stars?

Nothing

The diagram below shows our sun at some point in its life. What is the name we give the sun at this point? (diagram with different layers and He core)

Red Giant

Which of the following qualities changes significantly during a stars main sequence lifetime?

The composition of the core

As the high mass star fuses one fuel, the ash of the fusion reaction will accumulate in the core and fusion in the core will stop. What happens to the core at that point?

The core shrinks and heats up until the ash is finally able to fuse