How many protons does Tc have?
a. 93
b. 58
c. 48
d. 107
e. 43
e
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The lunar maria are primarily composed of ________.
A. anorthosite B. olivine C. silicon dioxide D. basalt
Which of these hypothetical observations (none of them are real) would force us to reconsider our modern, Sun-centered view of the solar system?
a. We discover a small planet beyond Saturn that rises in the west and sets in the east each day. b. We find that we are unable to measure any parallax for a distant galaxy. c. We discover an Earth-sized planet orbiting the Sun beyond the orbit of Pluto. d. We discover that the universe is actually contracting, not expanding.
The motor of one car is more powerful than the motor of another car. Which of the following must be true of the more powerful motor?
A) It can do work more quickly B) It can operate for a longer time. C) It can burn fuel more efficiently. D) It can store more potential energy.
When a hydrogen atom's electron goes from an energy state of n = 1 to n = 3,
a. the radius of the electron's orbit is unchanged. b. the radius of the electron's orbit is increased. c. the radius of the electron's orbit is decreased. d. the radius of the electron's orbit is infinite.