How many 3d electron states can an atom have?
A) 8 B) 4 C) 10 D) 6 E) 0
C
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An interstellar gas is emitting 10-centimeter wavelength radiation, and a nearby star is emitting 10-micrometer wavelength radiation. Which of these can you observe through an Earth-based telescope?
A. the star B. the interstellar gas C. both interstellar gas and the star D. None of these choices are correct.
An element that tends to gain electrons during chemical reactions is probably
a. a semimetal. b. a nonmetal. c. an actinide. d. a metal.
Atmospheric pressure is 1.0 × 10^5 N/m2, and the density of air is 1.29 kg/m3 . If the density of air is constant as you get higher and higher, calculate the height of the atmosphere needed to produce this pressure
a. 7900 m c. 1260 m b. 77,000 m d. 10,300 m
A certain window glass has spectral transmissivity as shown in the figure. Determine the effective transmissivity from a source at 1000ºR.
