for questions about design, process, data, or analysis of experiments and observations.

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16
votes
2answers
855 views

Could Google scan books without opening them?

A few years ago, I read an article about a proposal Google put forward, as part of it's paper to digital media project, which had the advantage of greatly speeding up the process of scanning text. ...
-3
votes
1answer
47 views

Constancy of the speed of light in the hypotenuse of the triangle in the Michelson and Morley experiment [on hold]

In Michelson and Morley experiment, Michelson calculated that the total time traveled by light with respect to the stationary observer standing at ether field was $2L/c$. Here, Michelson followed ...
-2
votes
0answers
20 views

What should I study if I am interested in creating innovative gadgets? [on hold]

I’m interested in gadgets and I know it requires programming skills. But on the other hand I really like experimental physics. So, I don’t know how to combine these science areas together.
2
votes
0answers
28 views

How correlated are the statistical significances of the same signal/non-signal for CMS and ATLAS?

Consider a diphoton excess for both ATLAS and CMS at the same energy for two cases: false signal: I'd expect the two statistical significances to be uncorrelated true signal: I'd expect the two ...
0
votes
0answers
17 views

Self Heating in Platinum Resistance Thermometers

In order to use a PRT a small excitation current has to be passed through it, which creates a heating effect that in turn adds an error to the measured temperature. The question is this: If we have ...
5
votes
0answers
90 views

How does the “Look Else Where Effect” affect the chances of detecting a false diphoton excess at the LHC?

Back in December 2015, there was found a 750 GeV diphoton excess in both CMS and ATLAS at the same location with a significance well above $3\sigma$; a 0.13% chance of being false. However, there ...
4
votes
1answer
71 views

Matter's wave-particle duality - true? [duplicate]

I had an interesting conversation with CuriousOne the other day about the question Experiment that demonstrates the wave-particle duality of electrons. I thought that wave-particle duality existed, ...
0
votes
2answers
74 views

Why does hot water freezes faster than normal water? [duplicate]

What is the reason behind hot water gets Freezes faster than normal water when we keep both the hot and normal water together in freezer ?
2
votes
2answers
39 views

Standard convention for $x$ error bars

What is the standard convention regarding the error bars of the independent quantity in a graph? In what situations should I show the $x$ error bars? In case both $x$ and $y$ uncertainties are ...
0
votes
1answer
38 views

Why can't weak core-less electromagnets be used in conjunction with strong permanent magnets to perpetually harvest energy?

Why can't weak core-less electromagnets be used in conjunction with strong permanent magnets to perpetually harvest energy? Magnets will attract ferrous materials but some materials like copper or ...
0
votes
0answers
14 views

relationship between creep and hysteresis

For a particular material that's suspected to be viscoelastic, I observe a hysteresis curve where the difference in elongation between the loading and unloading curves ranges between 5% and 10% for a ...
1
vote
2answers
63 views

How does mass affect slipping of a rolling object?

I experimented by rolling a cylinder down a tube and noticed that by increasing its mass, it's time taken to reach the bottom decreased. Found out that mass doesn't actually affect the time taken, ...
1
vote
0answers
27 views

Milky quartz stones give off odour after being struck - persistent tribo-odorosity(?)

I have these white stones that give off a strong sulphur-like smell when struck together to produce a spark (triboluminescence). This is mostly due to hydrogen sulphide as suggested by many sources ...
0
votes
1answer
59 views

How noticeable is the gravitational pull of a mountain range?

A massive object like a planet exerts a great gravitational pull on nearby objects. This will cause them to accelerate towards the center of the planet with the same acceleration regardless of their ...
0
votes
1answer
42 views

necessary and sufficient conditions for linear elasticity

If it's experimentally observed that a particular elastic isotropic material has a linear relationship between stress and strain for a certain range of stresses and strains, does it follow that a ...
108
votes
3answers
4k views

Why is the vibration in my wire acting so oddly?

I was soldering a very thin wire today, and when I had one end firmly soldered, I accidentally bumped the wire diagonally with my tweezers. What I'd expect to happen is that the wire oscillates for a ...
6
votes
1answer
154 views

Can photons move in parallel?

Is it possible that two photons move in parallel, on the same trajectory - having the same wavelength, but differ in phase? Is it fundamentally possible on the level of quantum mechanics? Is it ...
1
vote
0answers
8 views

How can I estimate meta-uncertainty?

A type A uncertainty estimate is derived from repeated measurements. For example, I may estimate the uncertainty on a measurement by repeating the measurement $N$ times and then calculating some ...
-1
votes
0answers
20 views

The method of measuring total nuclear angular momentum [on hold]

we know that total nuclear angular momentum of deuteron is equal I=1.pleas Introduce way to this measurement (experimental way). thanks
-5
votes
1answer
68 views

About my last question of the problem of young experiment [duplicate]

as you can see Ive conducted the young experiment with these tiny tiny holes you can see in the pics but get no result again. why ? I asked and your answer was about the size of slit but these slits ...
2
votes
0answers
32 views

Do Thorlabs piezoelectric transducers s PAZ009 and PAZ015 wor in vacuum?

We have few closed loop piezoelectric transducers (stacked) from Thorlabs, part numbers PAZ009 and PAZ015. I have prepared all the required feed through. I want to use them under rough vacuum $\sim 10^...
-3
votes
0answers
50 views

Was Einstein familiar with the Michelson-Gale experiment?

Was Einstein familiar with the Michelson-Gale experiment (related to Sagnac's experiment)? If so, did Einstein explain the results of the Michelson-Gale experiment with his relativity theory? If so, ...
0
votes
2answers
67 views

How much pressure would I lose on one side?

The equation for the gas flow rate (in pressure*volume/time units) $$ Q = {kA\over d} (p_1-p_2) $$ where $A$ is the surface area, $d$ the wall thickness, $p_{1,2}$ the pressures on either side of the ...
13
votes
2answers
2k views

What's the problem with my Young slits experiment?

My Young's slits experiment doesn’t work. I mean I tried to see wave effect of light but I didn’t see any thing expect particles! I’ve sent you a pic of my laser and a short video of the experiment. ...
1
vote
0answers
20 views

LHCb Peaking Background

I was reading a paper on the estimation of the branching fraction of B+ to K pi pi gamma. I was wondering whether you could clarify the meaning of peaking background. Thanks!
6
votes
1answer
95 views

Alternate light and dark regions in cathode ray tube

There are a many alternate light and dark regions present in the cathode ray tube, as the pressure is reduced to minimum, like Crooke's dark space,negative glow, Faraday's dark space and at very low ...
2
votes
1answer
35 views

How to determine my position using Coriolis effect?

The Coriolis effect is the effect that causes wind and water and moving objects to curve clockwise in the northen hemisphere and anticlockwise in the southern hemisphere, so how to determine my ...
0
votes
0answers
13 views

Leidenfrost effect: Liquid nitrogen and hot water

When you put hot water on liquid nitrogen, a huge fountain is observable. But are you still able to see this fountain if you put the liquid nitrogen on the water or would the Liedenfrost effect ...
3
votes
1answer
40 views

Running Constant Values At Very Low Temperatures

From Wikipedia Coupling Constants, using QED as an example. I realise that the one-loop beta function in quantum chromodynamics is negative. If a beta function is positive, the corresponding ...
0
votes
0answers
16 views

Question about experimental achievement in Optical phase conjugation

As I read here https://en.wikipedia.org/wiki/Nonlinear_optics#Optical_phase_conjugation it is very interesting thing. What is real experimental achievements in this area or everything works only in ...
6
votes
2answers
175 views

What happen if Hawking radiation is not found?

I'm not a physicist but reading from a few popsci books. I read that Hawking has equations that explain Hawking Radiation precisely, right? Is this equation a proof that the radiation is real or we ...
0
votes
0answers
35 views

how can I detect cosmic muons from background?

Is there anything I should be careful with if I would like to detect muon at sea level? Noise background? Threshold? Even signals from other particle with stronger flux rate?
0
votes
0answers
25 views

Antenna measurements and parameters calculation

Lets suppose we have some data collected from antenna measurement. For every theta and phi point in any coordinate system ( here refering to Ludiwg coordinate systems II and III) the data can be ...
0
votes
0answers
29 views

How to measure the spin of a particle?

How we can measure the spin of a particle from the angular distribution of its decay products? for spin zero particle the distribution is flat while for spin 1 particle the distribution is different, ...
1
vote
1answer
55 views

Is there a way to strip all the electrons from single atom with atomic number greater than 2

Please explain by what means electrons extraction can be done. How person can focus activity on single atom (from precision point of view) to do so? How at each step person can know how much electrons ...
0
votes
0answers
84 views

Detecting supersymmetry

What would scientists in particle colliders look for as evidence of supersymmetry?
6
votes
0answers
43 views

How extremely low temperatures (near absolute zero) are actually measured [closed]

How do the industrial or laboratory thermometers for this purpose work like: what effects are based on, what are other alternatives how accurate they all are
0
votes
0answers
30 views

Can orbiting a black hole 99.99% speed of light make other object with relatively fast clock travel faster than light, relative to me?

If i orbit a black hole, 99.9% speed of light, time for me is moving slowly, relative to me, planet earth is aging fast, and i have traveled 10 years into the future(relatively) in 1 second, suppose ...
2
votes
1answer
40 views

propagation of error - sin^4

I am currently working on an analysis of a Rutherford scattering and encountered a somehow strange behaviour for the errors. It basically boils down to the behaviour of: $$\sin(\theta/2)^4$$ For ...
1
vote
1answer
27 views

looking for a technique for conducting experiment [closed]

I have used a servomotor and a controlling circuit to produce oscillatory motion for an experiment that involves flapping of a tiny metal plate (~few mm) inside liquid. I could not be very successful ...
1
vote
1answer
54 views

about the Pound-Rebka experiment and the answer to a second year undergrad student' s question 7 months ago [closed]

The answer tells us about a specific subtraction of the doppler shift so as to obtain the net gravitational redsift. Can anyone explain all this thing about that subtraction?
1
vote
3answers
202 views

How do we know that an electron “spins”?

As far as I know, you can't necessarily isolate an electron to observe it, you can only observe its effects on other particles due to fields. Moreover, we can't know an electron's exact location or ...
0
votes
0answers
14 views

meaning of ISR and Heavy signal

I was reading a paper on particle physics and came across two undefined terms which are ISR and Heavy signals. I would really appreciate any help explaining what those terms mean. Thank you in advance....
8
votes
1answer
115 views

Experimental data for asymmetric Newton cradle

Using a "successive impact model" (as if each ball were seperated from the other ones), I produced the following animations: You can see any combination of balls with masses of 1 or 2 (left) or 1 ...
-3
votes
1answer
73 views

Conservation of energy in the form of y=kx +b?

I am doing an experiment on method of mixtures and specific heat capacities. During my experiment I have to use the graph as a means of finding the SHC of the subject. So I did the experiment with ...
1
vote
0answers
29 views

Galileo's pendulum and any references

In some texts about the simple pendulum we use to see references about some "experiments" Galileo Galilei did realize and whereby he found some important results, including that the period of the ...
3
votes
1answer
135 views

How to read numbers reported in this LIGO paper?

I am not sure how to read the numbers in this excerpt from the abstract of GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence: Are the +/- small ...
2
votes
1answer
51 views

High $p_T$ and high $Q^2$ in deep inelastic hadronic collisions

When reading about high energy collisions (for example proton-proton collisions at LHC), I always find the relation $Q\sim p_T$, which, for me, is hard to demonstrate. Moreover, I found statements ...
1
vote
0answers
33 views

Cheap DIY Zernike-Phasecontrast: Optical Thickness of a inkjet/laser printed contour for phasering? [closed]

Rough guess: Optical Thickness of a inkjet/laser printed contour? Edit I was wondering if there is any research regarding the refractive index and the height of an inkjet or laser printed contour?  ...
0
votes
0answers
17 views

Comparison of electron deflection tube and Hall effect

Consider an electron deflection tube (something like this: http://www.ld-didactic.de/documents/en-US/GA/GA/5/555/555624e.pdf). Suppose you apply a magnetic field perpendicular to the screen. Then ...