Two radio antennas A and B radiate in phase. Antenna B is a distance of 140 m to the right of antenna A.

Two radio antennas A and B radiate in phase. Antenna B is a distance of 140 m to the right of antenna A. Consider point Q along the extension of the line connecting the antennas, a horizontal distance of 30.0 m to the right of antenna B. The frequency, and hence the wavelength, of the emitted waves can be varied.

  • What is the longest wavelength for which there will be destructive interference at point Q?
  • What is the longest wavelength for which there will be constructive interference at point Q?

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