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## Main Question or Discussion Point

we all know that there is upper limit for speed that is speed of light, but is there a lower limit, I mean is there quanta for speed.

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we all know that there is upper limit for speed that is speed of light, but is there a lower limit, I mean is there quanta for speed.

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The effective "lower limit" for speed will be the uncertainty principle, because of the wave-particle duality. The speed of a particle can be arbitrarily close to zero as long as the uncertainty in the position is sufficiently large (i.e. the particle is delocalized).

If a particle is confined to any discrete region of space, there will be a lower limit on its velocity. Hope this helps.

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Thank you that helped.

The effective "lower limit" for speed will be the uncertainty principle, because of the wave-particle duality. The speed of a particle can be arbitrarily close to zero as long as the uncertainty in the position is sufficiently large (i.e. the particle is delocalized).

If a particle is confined to any discrete region of space, there will be a lower limit on its velocity. Hope this helps.

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No, not at all.

The uncertainty principle applies for dXdP, not dXd(mv) which is a slight difference; in the case of light the uncertainty applies to its wavelength, frequency and energy via the relation P = hf/c where f is the frequency or alternatively, P = h/w where w is the wavelength.

Correct me if I'm wrong but that's how it seems.

The uncertainty principle applies for dXdP, not dXd(mv) which is a slight difference; in the case of light the uncertainty applies to its wavelength, frequency and energy via the relation P = hf/c where f is the frequency or alternatively, P = h/w where w is the wavelength.

Correct me if I'm wrong but that's how it seems.

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dst : your point, thought true, is trivial and semantical. In quantum mechanics there is no way to define an instantaneous (accurate) velocity; however, the concept of spacial motion does apply very closely to momentum --> hence it is the term that we should be looking at, in the "lower limit of velocity."

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