two towers on top of two hill are 40km apart the line joining them passes 50m above a hill halfway btw the towers .longest wavelength of radio waves which can be sent btw the towers .longest wavelength of radio wave which can be sent btw the towers without appreciable diffraction is

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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. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects?

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