Exam 10: The Sun As a Star

Through fusion,a star converts four hydrogen nuclei (each with a mass of 1.6726 × 10⁻²⁷ kg)to one heluim-4 nucleus (with a mass of 6.6465 × 10⁻²⁷ kg). How much energy,in joules,is released in each such reaction?

Convection in the Sun is triggered when:

Which of the following events have caused extensive power outages on Earth?

Which of the following is NOT related to the solar magnetic cycle?

How would the Sun change if it rotated as a solid body,like the planets do,rather than differentially?

Why are sunspots dark?

Which of the following is NOT identical among all isotopes of a given element?

The net result of the proton-proton chain in the Sun is to convert:

Sunspots always occur in:

What is required to overcome the electrical repulsion of atomic nuclei?

In which of the following ways are oxygen-16 and oxygen-17 the same?

A star loses one billion kilograms of material per second as it fuses hydrogen to helium.Approximately how much energy does the star produce each second?

What are the two properties that define a star?

The Sun produces energy through:

A sunspot has a temperature 80% as large as the rest of the Sun's surface.How much LESS light does it produce per unit area than the rest of the Sun?

Sunspots are dark because:

Which of the following is necessary for the solar dynamo to operate?

The figure below shows the layers of the Sun,each labeled by a letter (from A at the center to F as the outermost layer).Identify all six of these layers by name.

A convection cell on the Sun's surface fades away after approximately:

A sunspot is 16 times fainter than the solar material immediately next to it.If the Sun's surface is normally 5,800 K,how hot is the sunspot?