Some people mistakenly call noon and midnight ______________ and ______________
Fill in the blank(s) with correct word
12 A.M.; 12 P.M.
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What is the force that keeps a main sequence star from collapsing on itself?
A) Magnetism B) Gravitation C) The strong force D) Radiation pressure E) Electron degeneration pressure
A single slit, 1400 nm wide, forms a diffraction pattern when illuminated by monochromatic light of 490-nm wavelength
What is the largest angle from the central maximum at which the intensity of the light is zero? A) 44° B) 41° C) 38° D) 35° E) 32°
The loss of an electron from a neutral helium atom results in
A) neutral hydrogen. B) ionized hydrogen. C) ionized helium. D) neutral deuterium. E) ionized deuterium.
A circular loop of wire is rotated at constant angular speed about an axis whose direction can be varied
In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced emf is to be a maximum? A) It must be vertical. B) Any horizontal orientation will do. C) It must make an angle of 45° to the vertical. D) It must make an angle of 45° to the direction North. E) It must make an angle of 90° to the direction North.