Atoms can be photographed by
A) electron beams.
B) scanning electron microscopes.
C) both of these
D) neither of these
Answer: C
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Earth is farthest from the Sun in July and closest to the Sun in January. During which Northern Hemisphere season is Earth moving fastest in its orbit?
A) Spring B) Summer C) Fall D) Winter
Observing star clusters will give astronomers needed data for stellar evolution because all the stars in the cluster have the same ____
a. masses b. temperatures c. ages d. luminosities e. apparent magnitudes
Which of the following would decrease the magnification of a compound microscope?
a. Replacing the objective lens with one of larger diameter. b. Replacing the eyepiece lens with one of shorter focal length. c. Replacing the eyepiece lens with one of smaller diameter. d. Replacing the objective lens with one of longer focal length.
A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of the magnetic field 1.5 mm from the axis of the wire?
a. 3.0 mT b. 12 mT c. 5.3 mT d. 7.4 mT e. 8.0 mT