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The superposition of radio waves with approximately the same frequency is called:
• A
diffraction
• B
absorption
• C
reflection
• D
interference
Waves are a means by which energy travels.
Electromagnetic and physical waves reflect, refract and diffract energy.
These properties of motion are important because they explain how waves move.
• Reflection is when waves, whether physical or electromagnetic, bounce from a surface back toward the source.
• Refraction is when waves, whether physical or electromagnetic, are deflected going through a substance. The wave generally changes the angle of its general direction. In physics refraction is the change in direction of a wave passing from one medium to another caused by its change in speed.
• Diffraction occurs when a wave encounters an obstacle or a slit these characteristic behaviors are exhibited when a wave encounters an obstacle or a slit that is comparable in size to its wavelength.
• Interference is the phenomenon where waves meet each other and combine additively or substractively to form composite waves. In a sense there are similarities between interference and diffraction in the fact that both phenomena from a given wave produce other waves (with in general different frequency or phase and/or amplitude etc.). The main difference is the mechanism, diffraction involves a wave and some obstacle or object which deflects the wave or bends it and intereference involves a wave which combine with other waves.

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