Colors seen in the flames of a burning log originate with the variety of
A) multi-layered incandescent surfaces.
B) electron transitions in various atoms.
C) temperatures.
D) absorbing gases between the log and the viewer.
Answer: B
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Which of the following statements best describes the line of stability?
Coulomb's Law: As shown in the figure, three charges are at the vertices of an equilateral triangle. The charge Q is 6.7 nC, and all the other quantities are accurate to two significant figures. What is the magnitude of the net electric force on the charge Q due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
A. 2.1 × 10-3 N B. 1.2 × 10-3 N C. 1.0 × 10-3 N D. 1.4 × 10-3 N
The data points on this graph represent the measured spectrum of the cosmic microwave background, while the solid curve represents a theoretically calculated thermal radiation spectrum for a temperature of 2.73 K. What is the significance of the near-perfect match between the data and the theoretical spectrum?
A) It shows that the cosmic microwave background has a thermal radiation spectrum, just as the Big Bang theory predicts it should. B) It shows that all objects in the universe emit thermal radiation. C) It tells us the average temperature of gas in the Milky Way Galaxy. D) It demonstrates that the universe must contain more dark matter than ordinary matter.
If the period of a pendulum is tripled, then by factor is the length of the string increased?
a. 3 b. 6 c. 9 d. 1/3