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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Answers by country

Euler spiral
Fraser spiral
Mach number
Doppler effect
answers
flagIndia
25%
4%
6%
62%
48
flagGermany
0%
37%
0%
62%
16
flagPoland
4%
26%
9%
59%
1131
flagAustralia
35%
0%
5%
58%
17
flagthe United Kingdom
21%
21%
0%
57%
14
flagthe United States
12%
38%
0%
48%
31
flagGreece
25%
33%
0%
41%
12