Quasars are common in the early Universe because ____ at that time
a. galactic collisions were more frequent
b. black hole collisions were more frequent
c. gas and dust clouds were denser
d. galaxies were more isolated
e. central bulges were larger
a
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A radioactive atom has 98 protons and 249 nucleons. If it undergoes alpha decay, what are the number of protons and nucleons, respectively, in the daughter nucleus?
A) 100, 249 B) 100, 245 C) 96, 245 D) 96, 247 E) 94, 247
Wire A and Wire B are each carrying the same current. If the diameter of Wire A is half that of Wire B, how does the drift velocity vdA in Wire A compare to that in Wire B?
a. vdA = 4 vdB c. vdA = vdB /2 b. vdA = 2 vdB d. vdA = vdB /4
Standing waves can result from _____ waves
a. longitudinal c. both longitudinal and transverse b. transverse d. neither longitudinal nor transverse
To be dimensionally consistent, distance [L], velocity [L/T], and time [T] must be related as follows.
A. distance = time/velocity
B. distance = velocity/time
C. 
D. 
E. 