How many octaves exist between 20 hertz and 2560 hertz?
A) 5
B) 6
C) 7
D) 8
E) 9
Answer: C
You might also like to view...
Which of the following statements is true of the third reaction in the proton-proton chain?
A) It yields a helium atom. B) It emits a neutrino. C) It emits a gamma ray. D) It yields carbon dioxide.
A 5,000 kg satellite is orbiting the Earth in a geostationary orbit. The height of the satellite above the surface of the Earth is 
A. 
B. 
C. 
D. 
E. 
Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons. If it is doubly ionized, what is the charge of the oxygen ion and how many electrons remain in the ion?
A) charge = +2; number of remaining electrons = 6 B) charge = +2; number of remaining electrons = 8 C) charge = ?2; number of remaining electrons = 10 D) charge = +2; number of remaining electrons = 2
Suppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current. What is the direction of the magnetic field created by that current at the center of the mirror?
1.left 2.right 3.horizontally toward you 4.horizontally away from you 5.no direction because the field has zero magnitude