What causes the image of a star to "twinkle" or scintillate?
A. a purely physiological reaction in the eye
B. the flickering fusion process in the stars
C. irregularities in the density of layers of Earth's atmosphere, rapidly refracting the light
D. None of these choices are correct.
Answer: C
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You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduces to
A) one-half its original value. B) one-fourth its original value. C) one-sixteenth its original value. D) none of the above
Like the Sun, main sequence stars are converting hydrogen into helium in their cores
Indicate whether the statement is true or false
The sum of vectors A and B is
a. 
b. 
c. 
d. 
Charge of uniform surface density (0.20 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2.0 m
a. 17 N/C b. 11 N/C c. 23 N/C d. 28 N/C e. 40 N/C