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Radar is an application of which effect?

Correct answer: A. Doppler's effect

  • A. Doppler's effect
  • B. Magnetic effect
  • C. Mechanical effect
  • D. Electrical effect

Explanation

Doppler Effect refers to the change in wave frequency during the relative motion between a wave source and its observer. Doppler effect is used to measure speed in RADAR sensors. When the fixed-frequency radio wave sent from the sender continuously strikes an object that is moving towards or away from the sender, the frequency of the reflected radio wave will be changed which is why the answer is A.

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About Waves

Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.

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