By radiometric dating, the oldest mineral in a sedimentary rock was found to be 1.4 million years old. What is the age of the sedimentary rock?
A) 1.4 million years
B) no older than 1.4 million years
C) no younger than 1.4 million years
D) Radiometric dating does not work for sedimentary rocks.
Answer: B
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Werner Heisenberg
A) developed a wave equation for matter waves (1926). B) was the first to produce X-ray-like diffraction patterns of electrons passing through thin metal foil (1927). C) set the limits on the probability of measurement accuracy (1927). D) suggested the existence of matter waves (1924). E) predicted the positron from relativistic quantum mechanics (1928).
Which of the following observations confirms that Sgr A at the center of our galaxy is indeed a supermassive black hole?
A) measurements of radio emission from gas around Sgr A B) measurements of occasional X-ray emission from Sgr A C) measurements of the orbits of stars around Sgr A D) measurements of trans-dimensional space warps in the vicinity of Sgr A
The purpose of the third prong on a common electric plug of an appliance is
A) to handle three-phase electricity. B) to provide an alternate live wire. C) to connect the appliance to zero ground potential. D) a substitute for a safety fuse. E) all of the above
________ occur about 130 km above Earth's surface near the polar regions when energy in the solar wind guided by Earth's magnetic field excites gases in the upper atmosphere
a. Coronas b. Flares c. Auroras d. Coronal holes e. Nuclear fission