Wave Characteristics: A radar receiver indicates that a pulse return as an echo in 20 ?s after it was sent. How far away is the reflecting object? (c = 3.0 × 108 m/s)
A. 1.5 km
B. 3.0 km
C. 6.0 km
D. 9.0 km
Answer: B
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At what angle is the Sun above the horizon if its light is found to be completely polarized when it is reflected from the top surface of a slab of glass (n = 1.48)?
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