To find an image by ray tracing requires
A)
four rays.
B)
two rays.
C)
eight rays.
D)
three rays.
E)
only one ray.
B
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The atomic nuclei of the same element always have the same number of protons
Indicate whether the statement is true or false
Two electrons are separated by 7.0 cm. What is the ratio of the electric force to the gravitational force between them? (me = 9.11 × 10^?31 kg, ke = 8.99 × 10^9 N/m2/C2, G = 6.67 × 10^–11 N/m2/kg2, and e = 1.6 × 10^?19 C)
a. 2.3E+2 b. 1.3E+20 c. 3.1E+22 d. 4.2E+42 e. 1
What is the CNO cycle?
A) a set of steps by which four hydrogen nuclei fuse into one helium nucleus B) the process by which helium is fused into carbon, nitrogen, and oxygen C) the process by which carbon is fused into nitrogen and oxygen D) the set of fusion reactions that have produced all the carbon, nitrogen, and oxygen in the universe
Which arrow best indicates the direction of the electric field at point P created by particle C?
A. A B. B C. C D. D E. Zero F. AA G. BB H. CC I. DD