Radioactivity Basics: An oxygen-15 nucleus, 
O, decays to another atomic nucleus by emitting a ?+ ray. What is the other atomic nucleus?
A. 
N
B. 
F
C. 
C
D. 
C
E. 
N
Answer: A
Physics & Space Science
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High-impact polystyrene is a copolymer of polystyrene and _________ rubber.
Fill in the blank(s) with the appropriate word(s).
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Kepler's analysis of planetary motion showed that the planets move _______________ when close to the Sun and _______________ when farther away
Fill in the blank(s) with correct word
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What is the slit spacing of a grating necessary so that 600-nm light will produce a first order principal maximum at 25.0° away from the centerline?
A) 1.42 ?m B) 2.01 ?m C) 3.12 ?m D) 4.12 ?m E) 5.44 ?m
Physics & Space Science
The ____ of an object can be measured in degrees
a. apparent brightness b. apparent magnitude c. zenith d. angular diameter e. color
Physics & Space Science