The most important advantage of CCDs over film is that:
A) they record much more light in a given exposure time.
B) their images do not have to be developed as film does.
C) they record colors better than film can.
D) they can cover larger areas of the sky than film can.
E) their images never fade, as film can.
A
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A v vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 5 s the acceleration of the ball is zero. We know that at t = 5 s,
a. the slope of the curve is non-zero. b. the velocity of the ball is not changing. c. the curve is not crossing the time axis. d. the curve is at v = 0, t = 0.
A compound microscope is made with an objective lens (f0 = 0.900 cm) and an eyepiece (fe = 1.10 cm). The lenses are separated by a distance of 10.0 cm. What is the angular magnification? (Assume the near point is 25.0 cm.)
a. ?253 b. ?450 c. ?770 d. ?980 e. ?635
A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
a. 0.40 mT b. 0.80 mT c. 0.10 mT d. 0.20 mT e. 0.75 mT