![]() We use graphs, drawings, metaphors, projections and many other devices. And yet we physicists are always making representations of it when we teach and popularise it. People often say that they can only be understood with mathematical equations and symbols. Quantum physics describes objects that are often "strange" and difficult to put into pictures: wave functions, superimposed states, probability amplitude, complex numbers to name but a few. When quantum physics is used to calculate other quantities, such as the energy, or the magnetic property of atoms, it is astounding in its precision. He showed that there is a limit to how accurately two quantities – for instance a particle's speed and its position – can be measured simultaneously. This myth originated partly in Werner Heisenberg's "uncertainty principle". It can predict certain properties with extreme accuracy, to 10 decimal places, which later experiments confirm exactly. Wrong! Quantum physics is probably the most precise scientific discipline ever devised by humankind. "Quantum physics is all about uncertainty" ![]() ![]() I will mostly be explaining what quantum physics isn't, rather than what it is… 1. Since Scrum is an iterative process, you can have great success by focusing on things that you can say with a fair degree of confidence, while still allowing for some uncertainty in all planning and estimates.Don't worry, you don't need to know much about quantum physics to read this article. I’m not saying that one method is better than the other, or would be the best for your team, but you’re not constrained by cosmic forces like uncertainty. Story Points removes the rigid constraint of estimating work in hours, and instead allows estimates based on similar user stories you’ve done in the past. Many Scrum teams already account for this by using Story Points for estimates rather than using hours. The more you know about how much work is required for a particular task, the less you know about the time it takes to complete the task. Just as there is an inverse relationship between the uncertainty of position and momentum, there is a similar relationship between energy and time. That’s because these are conjugate variables and also have to abide by the limit of uncertainty. Notice that it has the exact same form as the previous equation. s !), but the more you are checking up on a team’s progress there comes a point where you’re not learning anything new and are just affecting their momentum.Ī lesser known relationship (and one that also has implications in Scrum) is:.Granted ℏ is an extremely small value (~1 × 10−34 J If either of these values were completely knowable, then the right side of the inequality would be 0, rather a constant! The fact that it is a positive number means the more you know about an object’s position, the less you can know about its momentum. Where Δx is the uncertainty of position, Δp is uncertainty of the momentum, and ħ is Plank’s constant over 2π. Heisenberg’s actual uncertainty principle is represented by the formula: Because the heat from your mouth flows into the thermometer and slightly cools your body, you can never get a truly accurate measurement. This principle also has common classical examples, like how you can never accurately take your temperature using a mercury thermometer. So what does the observer effect have to do with uncertainty? Nothing, really, but it’s often misrepresented as a result from uncertainty, so I thought I would address it first. Just by getting a status update (taking a measurement to get the team’s position), he or she is consequently affecting the team’s momentum. It’s like if you have an overbearing manager demanding constant status updates. In order to detect an electron to tell us where it is, we have to transfer or absorb some momentum from the electron, thus changing its momentum.
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