Which of the following elements will most likely form an ion with a -2 charge?
A) Na
B) S
C) Ne
D) Mg
E) Cl
Answer: B
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Which of the following explains why, a million years from now, Alpha Centauri will no longer be the nearest star system to our own?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
Greenland and Antarctica are covered with glacial ice sheets called
a. valley glaciers. b. mountain glaciers. c. continental glaciers. d. none of the above.
The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an emission spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
Thin Lenses: A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?
A. -6.0 cm B. -7.5 cm C. -13 cm D. +18 cm E. +6.0 cm