Doppler Effect: Moving Objects & Wavelengths

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Every moving body is associated with a wavelength known as the de Broglie wavelength. This concept applies primarily to simple particles and is typically very short. While it can be amusing to calculate the wavelength of larger objects, like a London bus traveling at 30 mph, such calculations lack practical significance. The de Broglie wavelength is more relevant in quantum mechanics than in everyday scenarios. Understanding this relationship enhances comprehension of wave-particle duality in physics.
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Hello, what is referred to that every moving body has an associate wavelength ?

thank you
 
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But the de Broglie wavelength tends to be very short and can only be applied, with any real meaning, to 'simple' particles. It is fun to calculate the wavelength of a London bus, traveling at 30mph but is is not a valid thing to do.
 

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