Compare a corona of the moon to dropping a small stone into a pond
What will be the ideal response?
ANSWER: The corona is due to diffraction of light—the bending of light as it passes around objects. To understand the corona, imagine water waves moving around a small stone in a pond. As the waves spread around the stone, the trough of one wave may meet the crest of another wave. This situation results in the waves canceling each other, thus producing calm water. (This is known as destructive interference.) Where two crests come together (constructive interference), they produce a much larger wave. The same thing happens when light passes around tiny cloud droplets. Where light waves constructively interfere, we see bright light; where destructive interference occurs, we see darkness.
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When the separation distance between a pair of stars becomes twice their usual distance the force between them
A. increases to twice as much. B. increases to four times as much. C. decreases by one-quarter. D. decreases by one-half.
Gravity is the main force impelling movement in all of the following except ________
A) creep B) slide C) solifluction D) hydrolysis E) fall
The highest wind speeds of any weather phenomenon occur in ________.
A. tornadoes B. cyclones C. typhoons D. hurricanes E. derechos
Which of the following is a wind deposit?
a. Alluvial fan b. Bajada c. Yardang d. Playa e. Barchan dune