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Two towers on the top of two hills are 40 km apart. The line joining them presses 50 m above a hill half way between the towers. What is the longest wavelength of radiowaves which can be send between the towers without apprecialbe fiffraction effects?

A

12.5 cm

B

24.4 cm

C

33.3 cm

D

42.2 cm

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The correct Answer is:
C
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