A possible means for making an airplane radar-invisible is to coat the plane with an antireflective polymer. If radar waves have a wavelength of 3.84 cm, and the index of refraction of the polymer is n = 1.6, how thick would the coating be if a 180° phase change occurs at both surfaces?

a. 24 mm
c. 32 mm
b. 7.5 mm
d. 6.0 mm


D

Physics & Space Science

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(B) 2.27P
(C) 22.27P
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A helicopter is flying horizontally with a speed of 444 m/s over a hill that slopes upward with a 2% grade (that is, the "rise" is 2% of the "run")

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