According to astronomers, approximately how old is the universe?
A) 14 billion years
B) 14 trillion years
C) infinite
D) 14 million years
A) 14 billion years
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Indicate whether the statement is true or false
What layer of the Sun are we seeing in this photograph, and in what wavelength band was it photographed?
A) corona, photographed in x-rays B) chromosphere, photographed in visible light C) photosphere, photographed in visible light D) convection zone, photographed in infrared light E) radiation zone, photographed in x-rays
A straight 1.0-m long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength 0.20 T
If the wire experiences a force of 0.60 N, what is the current in the wire? A) 2.0 A B) 1.0 A C) 3.0 A D) 4.0 A E) 5.0 A
Ancient coal beds can be found in Antarctica because
A) at one time the climate of Antarctica was mild enough to support swamplands. B) ancient coal beds were frozen in the Antarctic ice. C) it used to be located in the northern hemisphere. D) it was located at the equator during the Carboniferous period.