Glass is transparent to light of frequencies that
A. match its natural frequencies.
B. are below its natural frequencies.
C. both of these
D. none of the above
Answer: B
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What is the elevation of the valley to the south of the wind gap (the valley with the Allegheny County/ Mineral County lines)? What is the vertical relief between the wind gap and the valley to the north? What is the vertical relief between the floor of the wind gap and the valley to the south?
What will be an ideal response?
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Indicate whether this statement is true or false.
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a. Benjamin Franklin b. Prince Henry the Navigator c. Matthew Maury d. Charles Darwin