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# Questions tagged [experimental-physics]

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

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### Has the curvature of space from GR ever been validated? [duplicate]

It is my understanding that at low gravitational potentials like we experience on earth that the time curvature dominates and that the curvature of space only becomes relevant within stronger ...
15 views

### Barrier layer photovoltaic effect (BLPVE) and Bulk photovoltaic effect (BPVE)

Ferroelectric materials typically exhibit the bulk photovoltaic effect (BPVE). My question is that if a material taken as an absorber in a device which works on barrier layer photovoltaic effect (...
51 views

### What is a CP number? In terms of CP-Symmetry and CP-Violation?

When researching the origins of CP-symmetry and CP-violation, and the Fitch-Cronin experiment demonstrating 'indirect' CP-violation, I came across these statements: https://www2.lbl.gov/abc/wallchart/...
133 views

### Error analysis in measuring wavelength using diffraction grating [closed]

If $\alpha_m$ are the diffraction angles where the diffracted wave has maxima, then the wavelength is given by the following $$d\sin{\alpha_m} = m\lambda.$$ In order to find $\lambda$, I've run a ...
66 views

### Is charge accumulated when two conductors of different resistivity placed in series in an electric circuit?

Let's say two long cylindrical conductors of resistivity ρ1 and ρ2 are joined together and a current I is flowing uniformly through the cross section So if we consider this scenario two different ...
1 vote
51 views

### When performing a fast likelihood fit (flavio) why can we assume the uncertainties are weakly dependent on fit parameters?

In the angular analysis of the $B^{0} \rightarrow K^{*}\mu^{+} \mu^{-}$, Wilson coefficients can be determined from experimental data of angular observables through the following (flavio - a python ...
19 views

### Why does the placement of a lens effect the shape of the interference pattern in the Michaelson Interferometer?

Consider the simple Michaelson interferometer configuration below: I'm working with this apparatus in lab, where we add an additional component (a bi-convex lens placed either between the light ...
1k views

### Why are accelerator beam neutrino experiments built an angle off the beam direction?

Was reading some papers and review articles on accelerator based neutrino experiments and this came up a few times. Most of what I could find mentions "shrinkage in neutrino energy spectra" ...
63 views

### Will water be superconducting if add enough pressure?

Recently, room temperature superconductor has draw a lot of attention. Previous studies haven shown $H_2S$ is superconducting near room temperature given enough pressure. I wonder if water $H_2O$ ...
100 views

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### Bernoulli and direct-air jet when using overhead vents

There is this famous experiment to demonstrate the Bernoulli effect, where you try to very rapidly inflate a loose air balloon of sorts, like shown for example in this video. Here's a still image so ...
1 vote
75 views

### By what experiment is the vacuum energy density actually measured?

I have heard that the actual vacuum energy density which is up to 120 orders smaller than the predicted QED value can be measured in experiments or cosmological observations? What are these ...
1 vote
23 views

### Do I need knowledge of fluid mechanics to do the ripple tank experiment? [closed]

I have to design and do an experiment for a course of my physics bachelor. I have thought about ripple tank in order to study diffraction, interference and maybe Doppler effect. As far as I read from ...
30 views

### Motor efficiency experiment

I want to try and measure the efficiency of the motor by varying voltage. So my independent variable will be voltage and dependent variable will be power. However when i actually am doing the ...
74 views

### How can we detect gravity phase-shift in quantum mechanics?

I have been searching for a satisfying answer on how we can detect the predicted phase shift due to the gravitational potential in quantum mechanics. Specifically, Sakurai, describes in his book the &...
106 views

### Reliability vs Accuracy vs Precision vs Validity [closed]

I am trying to distinguish the difference between Validity, Accuracy, Precision and Reliability. I understand that accuracy is a measure of how close something is to the true value and precision is ...
462 views

### How damping constant of pendulum varies with length of wire? (experiment result confusion)

I'm a high school student doing an experiment for my physics course. The experiment aims to find out the relationship between the damping constant and the length of the wire. The constant is ...
1 vote
113 views

### How to rule out that the speed of light was different in the past?

The constancy of the speed of light is a fundamental principle in modern physics, and it is supported by a wide range of current experimental evidence. There is no evidence to suggest that the speed ...
43 views

### Do lower frequency sound waves penetrate through materials better than high frequency waves

I was doing a physics experiment today where we played different frequencies at the same volume and a sound recorder at the other end with a sheet of cardboard in the middle. We found that the higher ...
1 vote
24 views

### Changing cube splitter's reflection% with paint

Hi folks, I need beam #2 to be reflected as close to 100% as possible, while ALSO allowing beam #1 to be transmitted through as close to 100% as possible. Will black paint on side 3 alow this? Or is ...
57 views

### Would a Magnet Weigh More on a Metal Scale than a Plastic One

If you had two scales, one made of metal one made of something like plastic (not magnetic), and weighed the same magnet on both scales would it read heavier on the metal scale rather than the plastic ...
1 vote