Scientific Notation: Which of the following numbers is the smallest?
A. 15 × 10-3
B. 0.15 × 100
C. 0.00015 × 103
D. 0.00000015 × 106
Answer: A
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Intensity: The amplitude of the electric field for a certain type of electromagnetic wave is 570 N/C. What is the amplitude of the magnetic field for that wave? (c = 3.00 × 108 m/s)
A. 2.91 µT B. 1.90 µT C. 1.10 µT D. 1.41 µT E. 2.41 µT
A 2-kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s, and they stick together. After the collision, the velocity of the combined bodies is
a. 0. b. 0.8 m/s towards the right. c. 0.8 m/s towards the left. d. 2.4 m/s towards the right. e. 2.4 m/s towards the left.
In general, slow reactions
a. are exothermic. b. are endothermic. c. have low activation energies. d. have high activation energies.
Blackbody radiation is from a body that
A) does not emit radiation in the visible. B) is black. C) deflects all radiation falling on it. D) absorbs all radiation falling on it. E) is actually white.