Photons play the role of exchange particles for the electromagnetic field in a manner similar to _______, which play this role for the strong interaction.
A. positrons
B. quarks
C. leptons
D. gluons
E. muons
D. gluons
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The best way to use a telescope to look for life on other planets is to
a. search for absorption from nitrogen in their atmospheres. b. search for absorption from oxygen in their atmospheres. c. search for emission lines from water vapor in their atmospheres. d. search for carbon dioxide on their moons.
For which of the following is the celestial sphere an accurate representation of reality?
A. the view of the stars from Earth B. the motion of the planets around Earth C. the spherical bubble that surrounds Earth D. the distance to the stars E. the motion of the Sun around Earth
Two solenoids are each made of 2000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
A. 1/4. B. 1/2. C. 1. D. 2 E. 4.
The fundamental unit of the silicon-oxygen minerals is in the shape of a
a. cone. b. tetrahedron. c. cube. d. sphere.