The centers of the granular cells on the surface of the Sun are brighter than the edges of the cells because the centers are hotter than the edges. The average time taken for energy generated in the center of the Sun to reach the surface layers and escape is calculated to be few hundred thousand yrs. The granular appearance of the surface of the Sun is evidence of what phenomenon occurring in or on the Sun? Convective motion under the solar surface Which of the following particles or types of radiation will provide the most direct information on the energy generation processes that are occurring at the present time in the solar core? c. Neutrinos A star in the lower left part of the Hertzsprung-Russell diagram, compared to a star in the middle of the diagram, is Smaller Two stars have the same luminosity. One star is spectral class B and the other is spectral class K. From this information, we know that the K-type star is larger than the B-type star. How can we characterize the rotation of the Sun? Differential rotation, with the equator rotating faster than the poles Two stars, P and Q, can be seen in the same region of our sky with the same apparent brightness, but star Q is twice as far away as star P. What is the ratio of the intrinsic brightnesses (luminosities) of these stars (star P-to-star Q)? c . 1-to-4
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