Exam 14: A Run-Of-The-Mill G-Type Starour Sun

At the center of the Sun,the temperature is roughly 15 million K.

Detection of solar neutrinos confirms that

In our Sun,hydrostatic equilibrium exists only in the core,where energy production via fusion can balance gravity.

Magnetic field is continuously produced and deformed in the Sun by

In a sunspot,the umbra is cooler than the penumbra.

The surface of the Sun appears sharp because

The solar magnetic field switches polarity every 11 years.

The solar neutrino problem was solved by postulating that neutrinos have a small mass and oscillate between five different types of neutrino.

The temperature of the corona is much hotter than any other layer in the solar atmosphere.

If a sunspot is half as bright as the surrounding photosphere of the Sun,what is the approximate temperature of the gas in the sunspot if the photosphere's average temperature is 5,800 K?

If the Sun converts of H to He per second and 10 percent of the Sun's total mass is available for nuclear burning,how long might we expect the Sun to live?

If a coronal mass ejection occurred on the Sun and ejected particles toward the Earth that traveled at the speed of 1,000 km/s,how long would it take them to reach Earth?

Explain why magnetic fields trap coronal gas over much of the solar surface but allow it to escape in coronal holes.

In the text we considered the case of a "too-large" Sun.Show that a star with the same mass,composition,radius,and luminosity as the Sun,but with a higher temperature (that is,a "too-hot" Sun),also leads to a contradiction.

Approximately how long does it take the photons released in nuclear reactions in the core of the Sun to exit the photosphere?

Our Sun is unique compared to the other stars in our galaxy because of its

Sunspots appear dark because

Hydrostatic equilibrium is a balance between

Why is hydrogen burning the main energy source for main-sequence stars? Give at least two reasons.

If the Sun converts of H to He per second and the mass of a single hydrogen nucleus is ,how many net proton-proton reactions go on per second in the Sun? What is the luminosity produced if the mass difference between a single helium nucleus and four hydrogen nuclei is ? Note that .