When air is cooled below its dew point without condensation, it is said to be
a. wet.
b. dry.
c. supersaturated.
d. unsaturated.
c
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A stream of electrons passes through a velocity filter where the crossed magnetic and electric fields are 0.020 T and 5.00 × 10^4 V/m, respectively. Find the kinetic energy (in electron volts) of the electrons passing through the filter. [1 eV = 1.60 × 10^?19 J]
What is the mean free path of molecules in an ideal gas in which the mean collision time is 3.00 × 10-10 s, the temperature is 300 K, and the mass of the molecules is 6.00 × 10-25 kg?
A) 7.22 × 10-8 m B) 4.32 × 10-8 m C) 9.19 × 10-8 m D) 1.39 × 10-8 m E) 6.71 × 10-8 m
What causes spherical aberration?
A. the lens surface is not perfectly smooth B. the outer edges of the lens produce a focus at a different point than the central rays C. light is an electromagnetic wave with intrinsic diffraction properties D. the absorption of light in the glass is a function of wavelength
Eros is the only asteroid upon which a spacecraft has landed
Indicate whether the statement is true or false