Let us assume that a photon has been emitted in vacuum going in a straight line. At any given moment in time, this photon will have travelled a distance of

Code:

`c * t`

**c**is the speed of light and

**t**the time since its emission. So technically, our Δx is in fact equal to

**zero**.

Theoretically speaking, it does not matter now what Δp is, because 0 *

*n*will always equal zero, and not a value greater than

Code:

`hbar / 2`

Assume that the photon has been emitted from a monochromatic laser. Such a photon will have a known frequency and wavelength. Given that for a photon,

Code:

`h / λ`

Does the uncertainty principle apply at all to such a photon?