A line representing a wave front for a wave should be drawn:
a. from the source to the receiver.
b. from one crest to the preceding crest.
c. along one of the crests of the wave.
d. in the direction the wave is moving.
c
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The flattening of a spherical body, usually caused by rotation, is referred to as__________
A) oblateness B) occultation C) collimation D) waning
The last major dinosaurs were wiped out as a consequence of a major impact with the Earth about 65 million years ago. All but one of the following statements would be regarded as evidence for this claim
A) The fossil record shows a mass extinction event 65 million years ago, where only 25% of the species survived. B) At least 150 craters from past impacts have been identified, including one of the right age and size in Mexico. C) A layer of iridium in 65-million year old sediments in the Earth's crust D) Multiple historical accounts describe a planetary-level flood and storm that wiped out most living things.
In order for two waves to interfere completely destructively, they must
a. have the same amplitude. b. be exactly out of phase. c. one wave's peak must align with the other's valley. d. be transverse waves. e. all of the above
Two vibrating tuning forks, held side by side, will create a beat frequency of what value if the individual frequencies of the two forks are 321 Hz and 326 Hz, respectively?
a. 323.5 Hz c. 5 Hz b. 647 Hz d. 2.5 Hz