An ideal gas undergoes an adiabatic process while -25 J of work is done on it. What is the change in the internal (thermal) energy of the gas?
A) 0 J
B) 25 J
C) -25 J
D) 50 J
E) -50 J
C
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Polarization: Light of intensity S0 that is polarized horizontally passes through three ideal polarizers. The first and third are horizontal, but the second one is oriented at 0.39270 rad to the horizontal. In terms of S0, the intensity of the light that passes through the set of polarizers is closest to which one of the following choices?
A. 0.729 S0 B. 0.125 S0 C. 0.427 S0 D. 0.854 S0
Shown following are the primary mirror arrangements and total light-collecting area of five different telescopes. Each mirror uses a different segmented arrangement, but assume that they are all equivalent in quality and in their ability to focus light. Also assume that the telescopes use identical detectors and have the same observing conditions. Rank the telescopes from left to right based on their ability to detect very dim objects, from greatest to least. To rank two (or more) telescopes as equal, drag one on top of the other(s).
In an electromagnetic wave, the electric and magnetic fields are oriented such that they are
A) parallel to one another and perpendicular to the direction of wave propagation. B) parallel to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) perpendicular to one another and parallel to the direction of wave propagation.
Balance the following chemical equation
________ N2 + ________ H2 ? ________ NH3 A) 1, 3, 2 B) 1, 2, 3 C) 3, 2, 1 D) 2, 6, 4 E) 1/2, 3/2, 1