A small object is enclosed in plastic (n = 1.5). The object appears to be 4.0 cm below the surface. What is the actual distance of the object below the surface?
A. 2.0 cm
B. 2.7 cm
C. 4.0 cm
D. 5.5 cm
E. 6.0 cm
E. 6.0 cm
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the path of the Sun through the sky as a result of Earth's orbital motion
What will be an ideal response?
The age of stars in a cluster can be determined by
A) finding spectroscopic binaries in the cluster. B) determining the main sequence turnoff point. C) finding pulsating variable stars in the cluster. D) counting the number of stars in each spectral class. E) fitting the position of the main sequence to the Sun.
What is 34 + (3 ) × (1.2465 ) written with the correct number of significant figures?
A) 37.74 B) 37.7395 C) 38 D) 37.7 E) 4 × 101
The Large Megllanic Cloud is
A) a bright nebula within our galaxy. B) an irregular galaxy colliding with the Milky Way. C) the farthest known object visible to the naked eye in a clear night time sky. D) an unusually bright planetary nebula.