In what part of the electromagnetic spectrum do the biggest telescopes on Earth operate?
A) visible B) ultraviolet C) radio D) X-ray E) infrared
C
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What is an ionization nebula?
A) a name sometimes used to describe spiral galaxies besides the Milky Way B) a region of very hot, low-density gas surrounding a recent supernova C) a clump of gas that will soon give birth to a new star D) a colorful cloud of gas that glows because it is heated by light from nearby hot stars
You do not see your image when you look at a flat rough aluminum surface because of __________
Fill in the blank(s) with correct word
Two long parallel wires each carry a current of 5.0 A directed to the east. The two wires are separated by 8.0 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the wires?
a. 72 ?T b. 48 ?T c. 24 ?T d. 96 ?T e. 32 ?T
The total kinetic and potential energies of all the atoms and molecules of a substance is its
a. heat. b. internal energy. c. temperature. d. thermodynamics. e. none of the above