Which is the best analogy of a wave? a. a wave is like building a ramp. b. a wave is like shaking a hand. c. a wave is like water rippling in a pond. d. a wave is like knocking down a building.

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque

Which basic property determines a colored light's placement on the spectrum of visible light? a. speed b. frequency c. amplitude d. velocity