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A motion that brings about change in the number of wavelengths between the reflector and the radar, in turn causes _________

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A motion that brings about change in the number of wavelengths between the reflector and the radar, in turn causes _________

(a) Time shift

(b) Phase shift

(c) Frequency shift

(d) Velocity shift

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My enquiry is from Aviation Communication Systems topic in portion Aviation Communication Systems of Aircraft Maintenance

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The correct option is (c) Frequency shift

Explanation: A motion that brings about change in the number of wavelengths between the reflector and the radar, in turn causes a frequency shift in the system. Such a shift may either enhance or degrade the performance of a system.

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