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What physical phenomenon is shown in the picture?

Euler spiral

Fraser spiral

Mach number

Doppler effect

The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842. The Doppler effect is based on the principle of radar or ultrasound.

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brewbooks wikipedia → Doppler effect

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14

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19

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65

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31

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10

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