The Doppler shift is the _______ of two frequencies.

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Multiple Choice

The Doppler shift is the _______ of two frequencies.

Explanation:
The Doppler shift is the difference between two frequencies. It’s the amount by which the received (observed) frequency f_r differs from the transmitted frequency f_0, expressed as f_D = f_r − f_0. Relative motion toward the source increases the received frequency, while motion away decreases it. This frequency difference is what we measure to assess velocity. It’s not a sum, product, or ratio of frequencies.

The Doppler shift is the difference between two frequencies. It’s the amount by which the received (observed) frequency f_r differs from the transmitted frequency f_0, expressed as f_D = f_r − f_0. Relative motion toward the source increases the received frequency, while motion away decreases it. This frequency difference is what we measure to assess velocity. It’s not a sum, product, or ratio of frequencies.

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