If a Radar system designed in accordance with the Doppler's effect, if an airplane is moving away from a Radar, the wavelength of the reflected wave from the air plane would be:
Correct answer: B. Larger than the transmitting wave
- A. Smaller than the transmitting wave
- B. Larger than the transmitting wave
- C. Same as that of the transmitting wave
- D. Either smaller or larger than the transmitting wave
Explanation
Source is moving away from observer so apparent frequency decreases and wavelength increases.
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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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