In a liquid, a current is set up between points A and B. Positive ions are going from A to B moving 6.0 coulombs of positive charge per second and negative charges are moving from B to A moving 2.0 coulombs of negative charge per second. What is the current from A to B?
A. 8.0 A
B. -8.0 A
C. 4.0 A
D. -4.0 A
E. 12 A
A. 8.0 A
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Which of the following lists the two key predictions of the Big Bang model that have been verified by observations?
A) (1) the existence of the cosmic microwave background and (2) the amount of helium relative to hydrogen in the universe B) (1) the existence of the cosmic microwave background and (2) the existence of dark matter C) (1) the existence of the cosmic microwave background and (2) the near-critical density of the universe D) (1) the predominance of matter over antimatter and (2) the near-critical density of the universe E) (1) the predominance of matter over antimatter and (2) the large-scale structure of galaxies
Aluminium has atomic number 13 . In its ground state, how many electrons are in its n = 1 shell?
a. 6 b. 2 c. 3 d. 10 e. 16
Does the change in speed of light when it enters a material substance indicate that light is more like a wave or more like a particle of the kind considered by Newton?
a. More like a wave. b. More like a particle. c. It varies from material to material. d. Similar to both. e. Not at all like either one.
A holographic plate produces an image for the viewer that is:
A. real B. virtual C. may be either virtual or real