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# Tag Info

Accepted

### Temperature is discrete but not countable?

I think you have misunderstood the comment to the original question. It is not saying that temperature is a discrete attribute. It is saying that temperature is an example of an attribute that can be ...

### Temperature is discrete but not countable?

In mathematics, the cardinality of a set is a measure of the number of elements of the set. For example, the set contains 3 elements, and therefore. has a cardinality of 3. Temperature T is an ...
1 vote
Accepted

### Do you have to know which radiation type are you measuring with a geiger counter to correctly estimate the equivalent dose rate?

Yes, you need to the know radiation type to calculate the biological harm $H$ from the measured dose $D$. From Equivalent dose - Calculation: $$H=\sum_R W_R D_R$$ where $H$ is the equivalent dose in ...
1 vote

### Understanding uncertainty calculations?

\begin{align*} (x_1+\Delta x_1)\times (x_2+\Delta x_2) &= x_1x_2\left (1+\frac{\Delta x_1}{x_1}\right)\left (1+\frac{\Delta x_2}{x_2}\right ) \\ &= x_1x_2\left (1+\frac{\Delta x_1}{x_1}+\frac{\...
1 vote
Accepted

### Understanding uncertainty calculations?

This is more of an Algebraic problem, but since it relates to measurements I suppose it does have some bearing on Physics. Let's generalize your problem a bit, let's call the two measured values $m_1$ ...
1 vote
Accepted

### Why does one need a low resolution when trying to tell $|0\rangle^{\otimes n}$ and $|1\rangle^{\otimes n}$ apart in a coarse grained measurement?

To get more intuition about what is happening, let's start with $n=1$. (n=1) The observable $S_z$ you defined will be just $S_z=\sigma_z$ and we have  S_z = \left | 0 \right \rangle \left \langle 0 \...
1 vote
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### Is wavefunction collapse “global”?

Yes, wave function collapse is global in the sense that you mean, though I would use the word "objective" instead of "global". The measurements that have been performed and their ...
1 vote

### What is the shortest controllable time?

It seems that we reached zeptosecond controllable time in 2021: Using transient magnons, Physicists have tuned the quantum phase of a quantum system embedded in a solid with a precision of 1 zs and a ...

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