Why Do Waves Affect Objects Like Floating Bottles?

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Waves transfer energy without moving matter significantly, which explains why a floating bottle can drift to shore due to wave action and wind. While waves are typically categorized as longitudinal or transverse, there are theoretical discussions about other types of waves, such as those not associated with particle movement. Good sound absorbers, like rubber, effectively dissipate energy from sound waves due to their ability to deform and return to shape, making them more effective than harder materials. The discussion highlights the relationship between wave mechanics and material properties in sound absorption. Overall, understanding these concepts enhances comprehension of wave behavior in various contexts.
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Hi there,

I have some questions which i hope forummers can contribute or give feedback. I have given thoughts to these questions as well, and i have written them in brackets for fellow forummers to critique.

1. If wave transfer energy but not matter, why a floating bottle in the middle of the sea will drift gradually to shore?

(My take on this question is that the wind plays a supporting factor. In additon, when waves break on shore, debris floating on the previously waves will get transported to shore. Wave breaking, after all, is the basis of how wind surfing works.)

2. Besides longitudinal and transverse waves, are there different types of waves?

(My take on this question is no. Other than a perpendicular, parallel or even circular axis of vibration of particles, of which we will then be talking about water waves, there can't be other axis of vibrations.)

3. What makes a good sound absorber?

(I understand the key concept is one of elasticity. Elasticity is not one of "stretchiness" , but rather the ability of a material that has changed shape when struck, to resume its initial shape when the striking force is removed. But still, it doesn't help to explain why rubber is a good sound absorber.I mean, rubber does go back to its initial shape right?! )

Thanks. And hope to hear your valuable comments soon.
 
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1. The matter of the stuff that's waving - in this case, ocean water - doesn't move (very much), but that doesn't mean it can't push other things along. Even without wind, a wave could move a bottle along the surface of the ocean.

2. You could have a wave that's not associated with anything moving, and that wouldn't be either longitudinal or transverse. For example, a wave of magnetic moment alignments in some ferromagnetic material (although I'm not really sure whether that would be possible in reality). Or you could simulate a numerical wave in a computer. But... when particle motion is involved, I believe all waves are either longitudinal or transverse, or some combination of those, since there isn't any other direction for the particle to move. (This also applies to electromagnetic and gravity waves, even though no medium of particles is involved in them)

3. Basically, it's the ability of the material to dissipate energy from pressure waves at the frequencies which are typical for sound. Generally speaking, soft things (rubber, cloth) are better dissipators than hard things. It takes a lot of energy to squash or dent or distort a hard object, and sound waves just don't have that much energy. So if the energy of the sound wave isn't enough to distort (break) the object, it has to bounce back. By contrast, something soft like rubber is easily distorted and it has no problem absorbing energy from sound.
 
Thanks Diazona, for this quick and wonderful reply!
 
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