Direct current is normally produced by a
A) battery.
B) generator.
C) both of these
D) neither of these
Answer: A
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A light-year is a unit of _____
A) time B) luminosity C) distance D) mass
Which portion of the electromagnetic spectrum is used in a television?
a) infrared waves b) X rays c) radio waves d) gamma waves
The satellite that found the ripples in the cosmic background that led to galaxies is
A) COBE. B) the Hubble Space Telescope. C) SOHO. D) the Chandra X-Ray Observatory. E) the Compton Gamma Ray Observatory.
If the average translational kinetic energy of the molecules of one sample of gas has twice the value of that of another sample of gas, how do the internal energies of the two gases compare?
1.The internal energy of the first gas is greater. 2.The internal energy of the second gas is greater. 3.The internal energies of both gases are the same. 4.We cannot determine which gas has the greater internal energy.