In a p-type semiconductor, a hole is
A) an extra proton supplied by a donor atom.
B) an extra electron supplied by a donor atom.
C) a donor atom.
D) a region where an electron is missing.
E) a missing atom in the crystalline structure.
D
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The greatest red shifts are observed for those galaxies that are
A. near our galactic equator. B. the brightest. C. nearest our galaxy. D. at the greatest distance from us.
In what constellation is the Sun be located at the moment of the March equinox?
A) Pisces B) Aries C) Orion D) Taurus E) Andromeda
A convex lens has focal length f. If an object is located extremely far from the lens (at infinity), the image formed is located what distance from the lens?
A) 2f B) f C) between the lens and f D) infinity E) between f and 2f
Human hearing is most sensitive around 2500 Hz. If the speed of sound is 340 m/s, what is the wavelength of this sound?
A. 340 m B. 0.14 m C. 2160 m D. 7.4 m