There are several elements that we regard as semiconductors. The common property of these elements is that they have
A. outer electrons which cannot move.
B. electrons, which are randomly organized about the nucleus.
C. no electrons beyond a closed shell.
D. four outer electrons beyond a closed shell.
Answer: D
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In noting that our world is "differentiated," we mean that:
A) the density of its materials decreases as you go downward toward the core. B) the Earth has evolved in a different pattern than any other planet. C) the iron and nickel core is denser than the silicate mantle and crust. D) radioactive heating in the core is at a slower pace than when the Earth was new. E) the Earth's magnetic field is different now in polarity than it was 700,000 years ago.
Describe the possible origins of Jupiter's vibrant colors. Contrast these with the origins of the colors of the other jovian planets
What will be an ideal response?
In a 35.0-mm single lens reflex camera (SLR), the distance from the lens to the film is varied in order to focus on objects at varying distances
Over what distance range must a lens of 55-mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to 0.60 m from the camera? A) 5.55 mm B) 4.44 mm C) 16.7 mm D) 22.2 mm E) 7.77 mm
A wrench is placed at 30 cm in front of a diverging lens with a focal length of magnitude 10 cm. What is the magnification of the wrench?
A) 4.0 B) 0.67 C) -0.67 D) -0.25 E) 0.25