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07-02-2020
Physics

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A swimming duck paddles the water with its feet once per time interval of 2.0 s, producing surface waves with this period. The duck is moving at constant speed in a pond where the speed of surface waves is 0.30 m/s, and the crests of the waves ahead of the duck have a spacing of 0.20 m.

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10-02-2020

Answer:

Part A: What is the duck's speed? v=0.2m/s

Part B: How far apart are the crests behind the duck = 1m

Explanation:

The concept applied here is the DOPPLER EFFECT, for example, if one is driving towards a station at 120km/hr, a higher frequency will be heard. and if you are driving away from the station at the same speed, one will hear a much more lower frequency. Tthese effect was proposed by the Austrian physicist by name Johann Christian doppler.

The detailed steps and appropriate formula is as shown in the attached file.

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