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Questions tagged [measurements]

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Uncertainty in the average of two measurements (with their respective uncertainty)

I know that generally the uncertainty in the mean of a sample should be equal to: $\frac{V_{max} - V_{min}}{2}$ where $V_{max}$ is the maximum value and $V_{min}$ the minimum value of the sample ...
140 views

Human body as a measuring instrument

One can easily find descriptions of human eyes and ears used for measuring phenomenons. Finding what resolution do eyes have or what frequencies can human hear is no trouble. It is also seen in scales ...
83 views

How did they measure -20 db sound?

Current world record for quietest room is Microsoft anechoic chamber that was measured at -20 db.How did they measure it? I mean,lowest noise measurement microphone I found is 1 inch special low ...
44 views

Measurement of decay rates and statistics

During my nuclear physics lab I was measuring decay rates of Fe59. The average was around 20 decays per second. But I did two series - in one I was measuring number of decays per 90 seconds and in the ...
348 views

How do you physically measure voltage and current?

Short Version: How exactly do (modern) voltage/current meters measure the numbers they do, from first principles? References much appreciated. We measure length with a ruler, time with a clock, and ...
236 views

Are there places in space completely devoid of light?

I'd be interested to know how far from the sun you'd have to be for it to feel 100% dark, as the human eye sees it. But also, are there places in space so far removed that there is nothing visible ...
81 views

What experimental bounds do we have on big $G$?

I know that there has been a large amount of controversy surrounding the exact value of the gravitational constant $G$, but I know that there is not a substantial difference in the measured value. So ...
69 views

355 views

How to measure mass of a Mosquito?

I though of a solution, by taking large number of mosquito and then measuring their mass and then averaging over, to get mass of a single mosquito. Is there anything other way than this?
4k views

What is the quantum mechanical definition of a measurement?

I hear the word "measurement" thrown around a lot in quantum mechanics, and I have yet to hear a scientific definition that makes sense. How do we define it?
80 views

What is currently the approximate precision or accuracy $\delta r$ with which the position $r$ of an electron can be measured?

The measurement of the position of an electron has associated, on the one hand, a quantum uncertainty $\Delta r$ which gives an idea of the probability cloud where the electron can appear, for example ...