What is the audible range of sound frequencies?
What will be an ideal response?
20. Hz to 20. kHz
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How will high tides differ from their average values when the Moon is in its full phase?
A. They will be higher than average. B. They will be lower than average. C. They will not differ from average values significantly. D. There are no high tides when the Moon is full.
A mirror lies flat on a table. A beam of light strikes the mirror with an angle of incidence or 15°, the reflected ray being to the right of the incident beam. The right edge of the mirror is then lifted so that the mirror now makes a 5° angle with the horizontal. What is the resulting angle between the incident beam and the reflected beam?
a. 25° c. 35° b. 20° d. The angle is not given.
According to this diagram, how much more abundant is hydrogen in the universe than nitrogen?
A) Hydrogen is about 10,000 times as abundant as nitrogen. B) Hydrogen is about 30% more abundant than nitrogen. C) Hydrogen is about 10 times as abundant as nitrogen. D) Hydrogen is about 4 times as abundant as nitrogen.
How have we been able to construct detailed maps of surface features on Venus?
A) by studying Venus from Earth with powerful telescopes B) by making computer models of geological processes on Venus C) by using radar from spacecraft that were sent to orbit Venus D) by landing spacecraft on the surface for close-up study E) by studying Venus with powerful telescopes on spacecraft that were sent to orbit Venus