A police officer's stationary radar device indicates that the frequency of the radar wave reflected from an automobile is less than the frequency emitted by the radar device. What is the direction of motion of the automobile with respect to the police officer?
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Answer:
Away from the officer.
Explanation:
This occurs due to Doppler effect. An easy way to understand this is to think in terms of wavelength. Think like this, suppose the automobile is moving towards the officer, the waves in between the officer and automobile seems to be compressed, so wavelength decreases, so frequency increases and vice versa.
Although this is not how the variation in wavelength takes place it is still helpful in figuring out the variations with frequency.
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