Vaporization is the process in which
A) molecules go from the solid phase to the liquid phase.
B) molecules go from the liquid phase to the gas phase.
C) molecules go directly from the solid phase to the gas phase.
D) electrons are stripped from atoms.
C
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Consider a flat steel plate with a hole through its center as shown in Fig.17-1. When the plate's temperature is decreased, the hole will
A) contract only if it takes up more than half the plate's surface area. B) expand if it takes up less than half the plate's surface area. C) contract. D) expand. E) remain the same size.
The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small
a. True b. False Indicate whether the statement is true or false
What drives the motion of the continental plates on Earth?
A) lava flows in trenches along the sea floor B) tidal forces C) convection cells in the mantle D) Earth's magnetic field E) rotation of the liquid core
If an electromagnetic wave has components Ey = E0 sin(kx - ?t) and Bz = B0 sin(kx - ?t), in what direction is it traveling?
A) -x B) +x C) +y D) -y E) +z