The upper boundary of the region in which the soil is saturated with water is known as the
a. water table.
b. aquifer level.
c. zone of aeration.
d. Moho discontinuity.
a
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Carnot Engine: An ideal Carnot heat engine has an efficiency of 0.600. If it operates between a deep lake with a constant temperature of 294.0 K and a hot reservoir, what is the temperature of the hot reservoir?
A. 735 K B. 490 K C. 470 K D. 784 K
As an object is lowered into a deep hole in the ground, which of the following assumptions must be made in regard to the object's potential energy?
a. The potential energy increases. b. The potential energy decreases. c. The potential energy remains constant. d. The potential energy increases and then decreases.
In the electron double-slit experiment with electrons, what happens when a detector is used to determine through which slit the electron actually passes?
A) The electron then acquires both a precise velocity and a precise position. B) The pattern on the screen suddenly becomes an wave-interference pattern. C) The electron suddenly jumps into a state of higher energy. D) The pattern on the screen suddenly becomes a non-interference pattern. E) Batman arrives.
From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm
What can we conclude? A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet.