A soap bubble (n = 1.35) is floating in air. If the thickness of the bubble wall is 115 nm, what visible light wavelength is most strongly reflected?
What will be an ideal response?
621 nm (red)
Physics & Space Science
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How does the velocity of sound in air vary with the air temperature?
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Spiral arms are obvious—easily-seen features—because they contain ____
a. dense molecular clouds b. atomic hydrogen clouds c. sun-like stars d. OB associations e. supernovae
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Where would a brown dwarf be located on an H-R diagram?
A) below and to the right of the lowest part of the main sequence B) above and to the left of the highest part of the main sequence C) in the upper right corner of the H-R diagram D) in the lower left corner of the H-R diagram
Physics & Space Science
In walking barefoot on red-hot coals, to prevent bits of coal sticking to your feet, it would be safer if your feet are
A) wet. B) dry. C) either of these D) none of the above
Physics & Space Science