While the photosphere produces chiefly visible light, most coronal energy is in the form of
A) infrared radiation.
B) ultraviolet light.
C) X-rays.
D) gamma rays.
E) radio waves.
C
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Life will most likely be able to appear and evolve on a planet around which stage of a star's life?
A) core hydrogen-fusion B) shell helium-fusion C) core helium-fusion D) shell hydrogen-fusion
Which moon of Saturn shows the largest impact crater, relative to its size?
A) Miranda B) Mimas C) Titan D) Enceladus E) Callisto
A shiny, spherical, metal alien jumps out of a perfectly good airplane and skydives for a few seconds. Its photographic friend snaps photos of the sphere with a special camera that also captures the forces on the object. Refer to the set of snapshots Q, J, Y, and L. Which snapshot depicts the forces just after the parachute has fully opened?
A. Snapshot Q B. Snapshot L C. Snapshot J D. Sapshot Y
An LRC ac series circuit has R = 15 ?, L = 25 mH, and C = 30 ?F. The circuit is connected to a 120-V (rms) ac source with frequency 200 Hz
(a) What is the average power dissipated by the circuit? (b) What is the power factor for the circuit?