In an LCR series circuit, if the AC frequency is increased to a very large value, what value does the magnitude of the angle between the current and voltage phasors approach?
a. 0°
c. 180°
b. 45°
d. 90°
D
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Galaxies sometimes have recession speeds that deviate somewhat from the exact speed predicted by Hubble's law. What do these so-called peculiar velocities reveal?
A) velocities due to the gravitational tugs of nearby galaxies or clusters of galaxies B) deviations in the rate at which the universe has been expanding at different times in the past C) These velocities indicate serious discrepancies with Hubble's law and with our view of an expanding universe. D) These velocities indicate that the expansion rate differs for different directions in space.
A transformer consists of a 1000-turn primary coil and a 4000-turn secondary coil. If the current in the secondary is 3.00 A, what is the primary current?
a. 6.00 A c. 48.0 A b. 0.750 A d. 12.0 A
Nonreflective coatings for camera lenses reduce the loss of light at various surfaces of multi-lens systems, as well as preventing internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.38) on
flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength l = 550 nm, a wavelength which is near the middle of the visual spectrum.
The peak of the radiation curve of a blackbody moves toward larger wavelength as its temperature increases
Indicate whether the statement is true or false