Which of the following statements about types of galaxies is not true?
A) Spiral galaxies have younger stars than elliptical galaxies.
B) Among the large galaxies in the universe outside of clusters, most are spiral.
C) Large elliptical galaxies are more common in clusters of galaxies than they are outside of clusters.
D) Elliptical galaxies are bluer and contain more dust than spiral galaxies.
D
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Life began in the sea
a. True b. False Indicate whether the statement is true or false
As of right now, the universe is apparently composed of ________ visible baryonic matter, _________ undetectable "dark" matter, and __________ undetectable "dark" energy. (Fill in the missing blanks.)
Ray says that interference effects cannot be observed with visible light because random phase changes occur in time intervals less than a nanosecond. Stacy says that doesn't matter if collimated light from a single source reaches multiple openings. (They are arguing about a light source 50.0 cm away from two 0.010 0 mm-wide slits, 2.00 mm apart, with a screen 1.00 m away from the slits.) Which
one, if either, is correct, and why? a. Ray, because the phases at the two slits will be random and different. b. Ray, because it takes light over 3 ns to travel 1.00 m to the screen. c. Stacy, because the difference in time of travel from the source to the slits is no more than about 7 × 10^-12 s. d. Stacy, but only if a lens is placed in front of the slits. e. Both, because interference of light never occurs outside a physics lab.
Consider a region of space where the electric field is uniform with magnitude 
, as shown below. What is the value of the specified potential difference in each case? (a) ?B - ?A? (b) ?C - ?B? (c) ?A - ?C?
A. 
B. 
C. 
D. 
E. 
F. 
T. zero