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Two sources of 6 MHz radio waves, labelled A and B, are 175 m apart. They emit in phase.
(a) What is the wavelength of the wave?
(b) Midway between the two, is there a maximum or minimum intensity, and why?
(c) How close to A is the intensity a minimum?
(d) Why isn't the minimum zero?
(e) How do your answers change if A and B emit out of phase?
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