Relate our magnetic field to the aurorae
What will be an ideal response?
The magnetic field's Van Allen radiation belts deflect the charged particles away from our equator toward the poles, where the charged particles spiral down the magnetic field lines and hit the ionosphere to create the colorful ionized patterns.
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The spectral lines are more distinct when viewed in a mercury vapor lamp under
A) high pressure. B) low pressure. C) same for each
A sonic boom is produced by an airplane flying at a speed
A) just below the speed of sound. B) equal to the speed of sound. C) greater than the speed of sound. D) all of the above E) none of the above
A soda straw is stuck into water at an angle of 36° to the vertical. Looking straight down, what does the angle of the submerged portion of the straw to the vertical appear to be?
What will be an ideal response?
Which of the following provides observational evidence that quasars have power sources that are fairly small in size?
A) Some quasars are more than a thousand times as luminous as the Milky Way. B) Quasars are always located very far away. C) Telescopic images show the very small power sources of quasars. D) The galaxies in which quasars are embedded often show disruption from the central energy source. E) Some quasars can change significantly in apparent brightness in just a few hours.