The wavelength of a certain portion of an electromagnetic wave is 314 nm. What is its frequency and classification?
A) 9.55 × 1014 Hz, ultraviolet
B) 9.55 × 1014 Hz, X-ray
C) 8.44 × 1015 Hz, X-ray
D) 9.55 × 1015 Hz, ultraviolet
A
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The Moon takes approximately ________ to go through a cycle of phases.
A. 90 days B. 30 days C. 7 days D. 1 day
Aristotle believed that natural laws could be understood by _______. In contrast to Aristotle's way of explaining nature, Galileo relied on __________.
A. logic; experiment B. experiment; logic C. mathematics; patterns D. patterns; mathematics
A conducting rod (length = 2.0 m) spins at a constant rate of 2.0 revolutions per second about an axis that is perpendicular to the rod and through its center. A uniform magnetic field (magnitude = 8.0 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the potential difference between the center of the rod and either of its ends?
a. 16 mV b. 50 mV c. 8.0 mV d. 0.10 mV e. 100 mV
A radioactive isotope of atomic number Z emits a beta-minus particle, and then the daughter nucleus emits a gamma ray. What is the atomic number of the resulting nucleus after both processes?
A) Z - 3 B) Z + 1 C) Z - 2 D) Z - 1