The Balmer lines are strongest in which class of star? a. O b. B c. A d. K c. M

Question

The Balmer lines are strongest in which class of star? a. O b. B c. A d. K c. M The diameter of the sun's visible surface is about that of Earth. a. the same as b. ten times greater than c. 100 times greater than d. 1,000 times greater than e. 10,000 times greater than Nuclear reactions in the sun take place, where the gas is hot and dense. a. only near the poles b. only near the center c. only near the equator d. only near the mid-latitudes e. in all of the above locations Energy in the core is produced by a. nuclear fission. b. nuclear fusion. c. conduction. d. convection. e. radiation. The average distance from Earth to the sun is a. 1 ly. b. 1 million km. c. 1 million miles. d. 1 billion km. e. 1 AU. The sun is a. a star. b. 1 AU from Earth. c. more than 100 times the diameter of Earth. d. all of the above. e. none of the above. The ecliptic is a. the centerline of the zodiac. b. the projection of Earth's orbit on the sky. c. the apparent path of the sun around the sky. d. all of the above e. none of the above

Explanation / Answer

53] c

The groupings, or spectral classes originally consisted of 15 types labeled A through O according to the strengths of the absorption lines, or the Balmer series, of hydrogen. Spectral class A contained the strongest hydrogen lines and class O the weakest.

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