The Perseid meteor shower gives us about a meteor every minute in mid:
A) January.
B) May.
C) August.
D) October.
E) November.
C
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The region in which charged particles are trapped by our magnetic fields is the
A) Aurora. B) ozone layers. C) Van Allen radiation belt. D) exosphere. E) ionosphere.
What is the kinetic energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT?
a. 0.65 eV b. 0.71 eV c. 0.84 eV d. 0.54 eV e. 1.4 eV
What is the chance of three heads and two tails being the result of the toss of five coins?
1.1/32 2.5/32 3.5/16 4.1/2
A microscope has an objective lens of focal length 1.4 mm and an eyepiece of focal length 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mm from the objective. How far apart are the lenses?
A) 20 mm B) 21 mm C) 23 mm D) 33 mm E) 41 mm