How Many Wavelengths Between a Node and an Antinode in a Standing Wave?

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In a standing wave, the distance between a node and the adjacent antinode corresponds to half a wavelength. This is derived from the characteristics of sine and cosine functions, where nodes represent points of no displacement and antinodes represent maximum displacement. Therefore, moving from one node to the next adjoining antinode covers a distance of 1/2 wavelength. Understanding this relationship is crucial for analyzing wave behavior in various physical contexts. The conclusion confirms that the answer is indeed 1/2.
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Homework Statement


If you go any node in a standing wave to the next adjoining antinode, how many wavelengths have you gone?


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The Attempt at a Solution

 
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draw a sine and or cosine function of radians vs amplitude. There is no way to describe this without giving the answer

which would be 1/2
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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