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14.A flare explodes on the surface of the Sun. It emits energy as X-rays, visible light, and radio waves. Which arrives at Earth, 150 million km away, first?

Select one:

A. X-rays

B. Visible light

C. They all arrive at the same time.

D. Radio waves

16.

Which of the following processes is a cause of the sunspot cycle?

Select one:

A. Small variations in the rate of nuclear energy generation in the solar interior

B. The winding of magnetic field lines due to the Sun's rotation

C. A slight gravitational contraction of the Sun

D. A large change in the amount of visible light emitted by the Sun

E. The Sun vibrates with an 11 year period

17.

The rotation of the Sun is

Select one:

A. fastest at the equator, slower at mid-latitudes, and slowest near the poles.

B. fastest at the equator, slowest at mid-latitudes, but spinning up to intermediate speeds around the poles.

C. fastest at mid-latitudes, slower at the equator, and slowest near the poles.

D. slowest at the equator, faster at mid-latitudes, and fastest near the poles.

Explanation / Answer

16) B. The winding of magnetic field lines due to the Sun's rotation

17) A. fastest at the equator, slower at mid-latitudes, and slowest near the poles.

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