A person uses corrective glasses of power -8.5 D that are worn 2.0 cm from her eye
(a) Is she nearsighted or farsighted?
(b) What is her far point without glasses?
What will be an ideal response?
(a) nearsighted (b) 14 cm
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If the layering of the close-packed planes in a FCC metal is ABCABCACABC, this is a _____________.
Fill in the blank(s) with the appropriate word(s).
Evidence that a gas consists mostly of empty space is the fact that:
A. the density of a gas becomes much greater when it is liquefied B. gases exert pressure on the walls of their containers C. gases are transparent D. heating a gas increases the molecular motion E. nature abhors a vacuum
A system of 18 electrons and 11 neutrons has a net charge of
a. –28.8 × 10^-19 C. b. 28.8 × 10^-19 C. c. –11.2 × 10^-19 C. d. –18.0 × 10^-19 C. e. 11.2 × 10^-19 C.
On a bright and sunny day, the intensity of solar radiation on the Earth's surface is 1 000 W/m2 . If the average wavelength of the sunlight is 500 nm, how many photons are incident on a square meter of the Earth's surface per second?