Which of the following is true of the apparent blackbody radiation emitted by the big bang?
A) It should now be in the far-infrared and radio parts of the spectrum.
B) It should now be in the far-infrared and ultraviolet parts of the spectrum.
C) It should now be in the near-infrared and radio parts of the spectrum.
D) It should now be in the near-infrared and ultraviolet parts of the spectrum.
A
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A ball bearing rolls along a smooth horizontal tabletop, and crashes head-on into a second ball bearing of half its mass. If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision, what was the initial speed of the first ball bearing?
A. More information is required B. 7.2 m/s C. 3.6 m/s D. 1.8 m/s
Which Mars mission searched for life in the Martian soil in the 1970's?
A) Pathfinder B) Phoenix C) Viking D) Mariner
Farsightedness can be corrected with a converging lens
Indicate whether the statement is true or false
What would happen if you broke the glass at the top of the column in this barometer?
a. Nothing, except that the mercury would be exposed to the outside air. b. The mercury would drop so that the level inside the tube would be equal to that outside the tube. c. The height of the column would decrease, but it would still be higher than the level in the surrounding dish. d. The mercury level inside the tube would be much lower than the surrounding mercury liquid because of surface tension. e. The mercury level inside the tube would be much higher than the surrounding mercury liquid because of surface tension.