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B Two towers on top of two hills are 40 km apart The line joining...

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B Two towers on top of two hills are 40 km apart The line joining them passes 50 m above a hill halfway between the towers Longest wavelength of radio waves which can be sent between the towers without appreciable diffraction is 2 25 cm 4 15 cm 1 12 5 cm 3 30 cm

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