A 4.0-cm tall object is placed 60 cm away from a converging lens of focal length 30 cm. What are the nature and location of the image? The image is
A) real, 2.5 cm tall, and 30 cm from the lens on the same side as the object.
B) virtual, 4.0 cm tall, and 60 cm from the lens on the same side as the object.
C) virtual, 2.0 cm tall, and 15 cm from the lens on the side opposite the object.
D) virtual, 2.5 cm tall, and 30 cm from the lens on the side opposite the object.
E) real, 4.0 cm tall, and 60 cm from the lens on the side opposite the object.
E
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A solar cell has a light-gathering area of 12.4 cm2 and produces 0.49 A at 0.93 V (dc) when illuminated with sunlight of intensity 884 W/m2 . What is the efficiency of the solar cell?
a. 42% b. 3.4% c. 64% d. 1.7% e. 19%
Earth is a noninertial reference system:
a. only because it rotates. b. only because it revolves. c. only because of the movement of the Milky Way Galaxy. d. only because of the motion of the Moon. e. because of all the various ways it moves, including rotation, revolution, and the movement of the Galaxy.
When light of wavelength 700 nm is used in a single-slit diffraction pattern, the central maximum has a width of 3.5 cm. When the light source is replaced by one of wavelength 500 nm, what central width will result?
A. 3.5 cm B. 3.0 cm C. 2.5 cm D. 4.9 cm E. 4.0 cm