Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram
a. cooler
b. brighter as seen from Earth
c. larger
d. smaller
e. more massive
C
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An optical system comprises in turn, from left to right: an observer, a lens of focal length +30 cm, an erect object 20 mm high, and a convex mirror of radius 80 cm
The object is between the lens and the mirror, 20 cm from the lens and 50 cm from the mirror. The observer views the image that is formed first by reflection and then by refraction. What is the position of the final image, measured from the mirror? A) 90 cm B) 102 cm C) 114 cm D) 126 cm E) 138 cm
The stellar spectral sequence, in order of decreasing temperature, is
A) OBAFGKM. B) OFBAGKM. C) OBAGFKM. D) ABFGKMO. E) BAGFKMO.
The number of protons in a nucleus is the __________ number
Fill in the blank(s) with correct word
How is the age of a rock determined?
A. by counting the number of circles just like the circles on the trunk of a tree B. by measuring the amount of calcium it contains C. by measuring the temperature of the rock D. by determining the ratio of argon to potassium