The source of all waves is
A) something that vibrates.
B) energy.
C) a force of some kind.
D) all of the above
E) none of the above
Answer: A
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At 96°F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90% when the temperature is 96°F, the humidity is 0.036 kg/m3
a. True b. False Indicate whether the statement is true or false
Energy Levels: The Bohr model of the hydrogen atom predicts an ionization energy of 13.6 eV. Using this model, what would we expect for the ionization energy of the Li++ ion, which has 3 protons?
A. 122 eV B. 40.8 eV C. 54.4 eV D. 27.2 eV E. 79.6 eV
If a net force accelerates a 4.5-kg tool at 40 m/s2, what acceleration would that same net force give to an 18-kg tool?
A) 180 m/s2 B) 10 m/s2 C) 160 m/s2 D) 9.8 m/s2 E) 32 m/s2
All the following statements are true. Which one can be attributed to the exclusion principle?
A) If we know the location of an electron quite well, we will have little idea where it is going next. B) If an electron and antielectron meet, they will turn into energy through mutual annihilation. C) An electron has energy equal to its mass times the speed of light squared. D) Two electrons with the same spin cannot occupy the same energy level in an atom.