Reverberation time of a room can be increased by covering the walls with better reflectors of sound
Indicate whether the statement is true or false
T
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A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform magnetic field which has a magnitude that varies sinusoidally with a frequency of 90 Hz. If the maximum value of the induced emf in the coil is observed to be 4.2 V, what is the maximum value of the magnitude of the varying magnetic field?
a. 59 mT b. 62 mT c. 65 mT d. 68 mT e. 31 mT
The x-rays that occur when a high energy electron beam is incident on a metal target will show what type of spectrum?
a. continuous b. line c. continuous spectrum superimposed with a line spectrum d. absorption
The geysers and hot springs of Yellowstone National Park result from
A) thin continental crust separating and creating a rift valley. B) plumes of hot mantle rising in a hot spot within a plate. C) plates that have slipped sideways relative to each other, creating a fault. D) a plate that has run up against an existing continental plate. E) a fault.
According to Mathiessen’s rule, the electrical resistivity of a metal is the _________of electrical resistivity of 0, 1, 2, and 3-dimensional defects and thermal vibrations.
Fill in the blank(s) with the appropriate word(s).