Which star will emit the shortest wavelength of its peak frequency?
A) a blue star
B) a yellow star
C) a red star
D) a green star
Answer: A
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What evidence do we have that an impact played a role in the extinction of the dinosaurs?
A. The dinosaurs, as well as large numbers of other animals and plants, disappeared rather suddenly. B. Astronomers have found evidence for a 65-million-year-old impact crater in the Yucatán. C. There is iridium (rare on Earth, but abundant in meteors) and soot (evidence of widespread fires) in a layer of clay laid down 65 million years ago. D. All of these choices are correct.
Energy Levels: When an electron jumps from an orbit where n = 4 to one where n = 2
A. a photon is emitted. B. a photon is absorbed. C. two photons are emitted. D. two photons are absorbed. E. None of the given answers are correct.
A car travels around a 35m radius unbanked curve. The static friction coefficient between the tires and the road is 0.45. What is the maximum speed at which the car can travel without slipping around this corner?
A. 2.8 m/s B. 27.6 m/s C. 12.4 m/s D. 7.5 m/s
Doubling the potential difference across a length of copper wire causes what change to the drift speed of the charge carriers?
1.No change occurs since drift speed is constant for copper. 2.The drift speed halves. 3.The drift speed doubles. 4.The drift speed quadruples.