Two isotopes of the same element differ only in the number of protons
Indicate whether the statement is true or false
FALSE
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The figure above shows the geological time scale of Earth. The time since dinosaurs went extinct (with the K-T event) represents approximately ________ of the Earth's history.
A) 0.15% B) 1.5% C) 15% D) 50%
Two identical objects A and B fall from rest from different heights to the ground and feel no appreciable air resistance. If object B takes TWICE as long as object A to reach the ground, what is the ratio of the heights from which A and B fell?
A) hA/hB = 1/ B) hA/hB = 1/2 C) hA/hB = 1/4 D) hA/hB = 1/8
The flat rotation curves of spiral galaxies tell us that they contain a lot of dark matter. Do they tell us anything about where the dark matter is located within the galaxy?
A) Yes, they tell us that dark matter is concentrated near the center of the galaxy. B) Yes, they tell us that dark matter is spread uniformly throughout the galactic disk. C) Yes, they tell us that dark matter is spread throughout the galaxy, with most located at large distances from the galactic center. D) No, we cannot determine anything about the location of dark matter from the rotation curve.
A stringed instrument has a node at each end of the string, while a wind instrument:
a. has an antinode at the open end and a node at the closed end. b. has a node at the open end and an antinode at the closed end. c. has antinodes at both ends of the column of air. d. has no nodes or antinodes at all. e. has a node at each end of the column of air, similar to a stringed instrument.