When an observer comes and actually measures the position of the particle, something called the wavefunction collapse occurs.

Part of the pulse is reflected back at the event and the observer measures the time at which he receives the echo.

On the other hand due to two different time axes the observers usually measure different path coordinates for the same event.

Therefore, this observer measures all of the seats to be at rest, since he is stationary from his own perspective.

When an observer comes and measures the position of the particle, then the superposition is reduced to a single possible wave function.

An observer can precisely measure either position or momentum, but not both.

First the observer measures a straight-line distance D from some observation point O to the object.

Then, using the clinometer, the observer measures the angle a between O and the top of the object.

The observer then measures to the bottom of the tree, again using percents.

The observer must always measure a leaning tree so that the tree is leaning to the left or right.