Stars of different spectral classes,O,B,A,F,G,K,M,show differences in the strengths of absorption lines of various elements.These differences are due to differences in
A)The chemical compositions of stars
B)The surface temperatures of stars
C)Stellar distances
D)Stellar ages

Question

Quizplus · Accepted Answer

The strengths of absorption lines in a star's spectrum are primarily determined by the temperature of the star's photosphere. Stars of different spectral classes have different surface temperatures, which leads to differences in the strengths of absorption lines. The chemical composition of a star can also have an effect on absorption lines, but this is generally a secondary factor compared to temperature. Stellar distance and age do not have a significant impact on absorption lines.

Stars of Different Spectral Classes,O,B,A,F,G,K,M,show Differences in the Strengths of Absorption