Nuclear Reactions: Determine the missing product X in the following nuclear reaction:
U + neutron ? 
Ba + X + 3 neutrons
Fill in the blank(s) with the appropriate word(s).
92 is over 36Kr
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What other population of stars are relatively old?
A.) Open clusters. B.) OB associations. C.) Globular clusters. D.) Blue clusters. E.) Superclusters.
An explosion occurs 34 km away. For sound that travels at 340 m/s, you'll hear the explosion in
A) 0.1 s. B) 1 s. C) 10 s. D) 20 s. E) more than 20 s.
One phenomenon that demonstrates the particle nature of light is:
a. the photoelectric effect. b. diffraction effects. c. interference effects. d. the prediction by Maxwell's electromagnetic theory.
Significant Figures: The last page of a book is numbered 764. The book is 3.0 cm thick, not including its covers. What is the average thickness (in centimeters) of a page in the book, rounded to the proper number of significant figures?
A. 0.0039 cm B. 0.072 cm C. 0.0079 cm D. 0.00393 cm E. 0.00785 cm