Which of the following statements about galaxies is true?
A) Small galaxies outnumber large galaxies and produce most of the light in the universe.
B) Small galaxies outnumber large galaxies but large galaxies produce most of the light in the universe.
C) There is an approximately equal number of small and large galaxies in the universe and together they each contribute an equal amount of light.
D) Most galaxies in the universe are about the same size as the Milky Way.
E) Galaxies come in a wide variety of shapes and sizes but are all very blue in color.
B
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a. the radiusof Earth b. the radius of Mt. Everest c. the radius of a grain of sand. d. the radius of a helium atom e. a radius of zero
The idea in fission-bomb design is to
A) form a supercritical mass from one or more subcritical masses. B) bring neutrons and subcritical uranium together. C) both of these D) neither of these
A 100-W resistance heater is connected to a 110-V dc source. What current flows through the heater?
A) 1.1 A B) 2.2 A C) 3.3 A D) 4.4 A E) 0.91 A
A sound source emits 30.0 W of sound power spread equally in all directions. What is the sound intensity level 30.0 m from the source?
A) 94.2 dB B) 83.2 dB C) 2.65 × 10-3 dB D) 2.65 × 10-3 W E) -25.8 dB