What distance method did Edwin Hubble use to determine the distance to local galaxies?
a. Hubble law
b. supernova observations
c. period-luminosity relationship of variable stars
d. parallax
c
Physics & Space Science
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The objective of an astronomical telescope has a focal length of 900 mm. The telescope has eyepieces of focal lengths 20 mm, 15 mm, and 10 mm. What is the highest magnification for this telescope?
a. 
b. 
c. 
d. 
e. 
Physics & Space Science
Discuss the differences between distance and displacement
What will be an ideal response?
Physics & Space Science
Parallel-Plate Capacitor: Which one of the arrows shown in the figure best represents the direction of the electric field between the two uniformly charged metal plates?
A. A B. B C. C D. D E. None of these
Physics & Space Science
Of photons of red, yellow, light, and blue light, which photons have the greatest energy?
a. red b. yellow c. green d. blue
Physics & Space Science