The pitch of a sound is determined by
A) the amplitude.
B) the speed.
C) the frequency.
D) the wavelength.
E) none of the above
C
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If the redshifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same redshifts, the quasar must
a. be very small. b. be within the Local Group. c. be a single star with an extremely large mass. d. be moving toward Earth with a large radial velocity. e. emit a very large amount of energy per second.
A large, flat, sediment-covered area on the ocean floor is called a(n) ______________
Fill in the blank(s) with correct word
If a new machine is more efficient than the old model, it uses a smaller amount of energy to do the same task
Why hasn't the experience with all the electric machines over the 130 year history of commercial electricity sales produced a machine that is 100% efficient?
Co-generation has the advantage that ________
a. more energy is generated than is put into the system b. the overall efficiency of the energy conversion process increases c. more waste heat is generated d. solar energy can be utilized to a greater extent