The star Elnath is classified as B7 III and the star Al Na'ir is classified as B7 IV. Compared with Al Na'ir, Elnath has about the same
A) surface temperature but is intrinsically much fainter.
B) intrinsic brightness but is considerably cooler.
C) surface temperature but is intrinsically much brighter.
D) intrinsic brightness but is considerably hotter.
Correct Answer:
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