The Heisenberg Uncertainty principle states that ΔxΔp > h/4π. What is represented by the terms Δx, and Δp? What can we say about p if the precise value of x is known? What does this mean for experimental results.

  1. Δx and Δp represent the uncertainty in position and the uncertainty in momentum respectively.
  2. If x is known absolutely then p cannot be known at all.
  3. This means that the precise position and momentum of a particle cannot be known at the same time.
DH

Related Physics A Level answers

All answers ▸

Two pellets are fired simultaneously from the horizontal, one is fired vertically at 100m/s and the other is fired at 200m/s at an angle theta from the horizontal. Calculate the angle of the second pellet if they both land at the same time.


Using Newton's law of universal gravitation, show that T^2 is proportional to r^3 (where T is the orbital period of a planet around a star, and r is the distance between them).


How can we derive the 'suvat' equations of motion v=u+at and s=(u+v)t/2


What is the optimum angle to throw a snowball for maximum horizontal displacement? (Ignore air resistance, assume the snowball is thrown level with the ground. The angle is measured from the ground up)