Difference between EM wave & a Matter wave ?

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Electromagnetic (EM) waves and matter waves differ primarily in their behavior and fundamental nature. EM waves travel at a constant speed relative to the observer, while mechanical waves, such as those in a string, travel at a constant speed relative to their medium. Matter waves, as described by de Broglie, have extremely small wavelengths for massive objects, highlighting their quantum nature. EM waves are considered more fundamental, as mechanical waves emerge from interactions among large numbers of atoms. Understanding these distinctions is crucial in the study of wave phenomena in physics.
mkbh_10
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Difference between EM wave & a Matter wave ?
 
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Well, what do you mean by "a matter wave"?
Do you mean, for example, what is the difference between a light wave and a wave in a string?
 
like we can take example of a tennis ball . Its mass is huge & by de broglie its wavelength is extremely small .

So what is the basic difference b/w EM wave & matter wave ?
 
mkbh_10 said:
So what is the basic difference b/w EM wave & matter wave ?

A mechanical wave travels at a constant speed relative to its medium.

An electromagnetic wave travels at a constant speed relative to the observer.

That is the most significant difference in behavior as I see it.

Electromagnetic waves are also more fundamental. Mechanical waves are emergent phenomena when large numbers of atoms interact. Similar to heat or color, they do not exist on a sufficiently small scale.
 
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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