Questions tagged [technology]

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11 votes
2 answers
1k views

What causes this strange noise in a pair of walkie-talkies?

Let us suppose that Bob and Alice both have walkie-talkies. They are both 3m apart from one another. Alice pushes her walkie-talkie to speak but instead of speaking, she starts walking toward Bob. ...
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1 vote
1 answer
31 views

Is there a formula for the distance an infrared sensor "senses"? [closed]

I'm making a Raspberry Pi-based infrared sensor for a school research project. Here's the link for the infrared sensor that is attached to the Raspberry Pi. At the moment, I don't have much ...
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-17 votes
2 answers
195 views

Can (and should) wifi internet be considered a force? [closed]

I've recently been using my wifi internet, for the last few years and have been enjoying it very much. I am able to communicate with my family across the globe in mere seconds, it's obviously a marvel ...
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0 votes
2 answers
71 views

Is it possible to create a laser in the extremely low frequency radio spectrum?

I have been reading about effort to push lasers into the hard X-Ray and soft Gamma Ray range, been quoted as one of the most important problems in physics according to Vitaly Ginzburg. However, would ...
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0 votes
1 answer
78 views

Why was RGB chosen as the basis / primary color set for pixels?

Human eyes have retinal cells that are sensitive to red, green, and blue light. Pixels on electronic screens use the same three colors to produce many apparent colors. But a little thought (and ...
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1 vote
1 answer
29 views

Is it possible to reveal a slight chronological change in frequency of Voyager 1 and 2 signals due to Hubble flow effect?

Is it possible to reveal a slight change in frequency of Voyager 1 and 2 signals due to Hubble flow effect? As both are about 1 light-day from Earth and as it is unbelievebly small distance compared ...
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0 votes
1 answer
260 views

Measuring mass of an object in outer space

How do (or will) people measure the masses of objects in outer space? (Like in ISS).
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2 votes
1 answer
19 views

How come we can grow nanowires? Semiconductors

I'm not a physicist by background but I'm interested in semiconductors and am trying to understand third generation semiconductor material technology. In some of the roadmaps for the 2nm and 3nm chips ...
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10 votes
4 answers
966 views

Why do dental drills need such high rpm?

Dental drills have always been cutting edge technology when it comes to high rotational speeds. According to Wikipedia modern drills reach more than 180 000 rotations per minute (rpm), which is 3000 ...
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  • 2,604
0 votes
0 answers
29 views

Advanced wind electricity generation

Well, when it comes to electricity generation it is important to design units to be scalable enough. With wind turbines becoming popular nowadays it is very important. As you know, currently wind ...
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5 votes
1 answer
142 views

What piece of technology is able to record the exact phase of microwaves?

I read that in VLBI, the signals of microwaves are recorded and then later combined. A famous example of this is the Event Horizon Telescope which imaged the black hole. Presumably, the telescopes ...
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1 vote
2 answers
68 views

Using technology in Physics [closed]

Currently I find that technology is a wonderful tool in efficiently understanding physics. It helps in giving access to resources and providing a better understanding of topics but what I dislike is ...
0 votes
1 answer
31 views

Optimal radiator sizes? [closed]

Imagine a situation where we need to generate 10 GW of electrical power for about an hour. It would probably require large equipment, which would also produce waste heat. Lets further imagine that ...
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0 votes
0 answers
22 views

Which techniques to explore the stoichiometry of a thin film surface material?

I wonder what other technological approaches are feasible to get the ratio of elemental distribution in the surface near layer of a coated (silicon) wafer. The layer thickness will be from several ...
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0 votes
2 answers
108 views

How exactly does quantum mechanics play a role in our day to day life?

From my understanding, quantum mechanics applies mainly to small microscopic particles. When it comes to macroscopic objects, the wave functions collapse and the quantum mechanical properties are lost....
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29 votes
3 answers
4k views

Is there any current technology that depends upon a deep understanding of quarks?

I think the title about says it all. If someone asks me "What good is the Theory of General Relativity?" (or what did Einstein do that was so great, or whatever) My pat answer is, "You use GPS ...
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  • 413
0 votes
2 answers
58 views

Atomic clock in kitchen microwave or other random electronics?

Is it possible for atomic clocks to be put in anything, say a kitchen microwave? Or a regular wall clock? If so, why are they not in all clocks? Is it cost? How much does this tech cost to add to ...
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0 votes
2 answers
41 views

Safe Laser displays

I hope this is in the right stack exchange. Here's my question, assuming that all blue lasers are too risky to the eye to risk [using], is it possible to use only low-energy red and green lasers and: ...
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4 votes
2 answers
369 views

How does the "Electromagnetic Position Tracking" work, exactly?

I've been searching the web for the technology of the "Electromagnetic Position Tracking1," and have found the web to be surprisingly ineffectual! I've just came up with some preliminary and basic ...
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  • 141
2 votes
1 answer
1k views

How nuking the poles of Mars would create an atmosphere? [duplicate]

Elon Musk said one of the methods they are taking into consideration to create an atmosphere on Mars is to nuke its poles. How nuking the poles would create the atmosphere?
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1 vote
1 answer
45 views

Is there a realistic explanation, why depending on the time of the day the picture on a CRT monitor is shifter either right or left?

Is there an explanation, why depending on the time of the day the picture on a CRT monitor is shifter either right or left, on a very old monitor (circa 1998)?
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2 votes
1 answer
53 views

Are large scale optical power delivery systems feasible?

I am attending an introductory course of optics and photonics and we just started to study optical fibers for digital communications. However, I have started wondering about using optical fibers to ...
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  • 1,083
0 votes
2 answers
552 views

Are infrared jammers possible, and how would they work?

In the C-64 game Gunship, the player can escape both radar-guided and heatseeking missiles. For the radar ones, he can use a physical countermeasure - chaff - as well as an electronic one - a radar ...
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1 vote
0 answers
88 views

Femtosecond-Camera Update

Hopefully I've posted in the correct page. Honestly, I wasn't really sure where to post... Around 2012 or so, Ramesh Raskar gave a TED talk about a femtosecond-camera produced at MIT. It has a good ...
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1 vote
1 answer
2k views

Is this incredible microscope technology real? [closed]

I recall reading about the relatively old invention of a microscope-like device; apparently able to zoom much further (and with greater clarity) than more "advanced" modern technology. I don't recall ...
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  • 169
0 votes
0 answers
3k views

Simple real life applications of Euler-Lagrange equations of motion

If you read some introductory mechanics text like David Morin's Introduction to Classical Mechanics about Euler Lagrange Equations you get a large amount of simple examples like the "moving plane" (...
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  • 1,505
3 votes
1 answer
222 views

What would happen if a gravitational wave hit me?

What would happen if a gravitational wave hits me? Will it affect me or will something else happen?
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  • 153
1 vote
0 answers
139 views

Which law of physics is applicable for communication? [closed]

What is the physics behind communication like internet, mobile phones etc. What are the equations?
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1 vote
1 answer
76 views

Charging with No Current

This may be a basic question, but I am not sure about the exact reason, so I'm asking this I've noticed quite a few times that when you plug an iPad charger to a socket and then switch it on, then ...
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  • 619
1 vote
0 answers
196 views

Superconductors and hoverboards

We know that superconductors are repelled by magnetic fields. The earth has a magnetic field of about $10^{-5}$ Tesla. I just want to know if it is possible to use this property of earth to make hover-...
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  • 619
1 vote
0 answers
1k views

How would you build a small cyclotron (particle accelerator)? [closed]

I heard Michio Kaku built a small cyclotron when he was young. I bought a book called "Principles of charged particle acceleration" where it explains the basic functioning of particle accelerators. ...
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  • 1,728
1 vote
1 answer
263 views

What does radiofrequency really do in NMR & MRI?

In NMR, the protons’ frequencies are affected by the magnet which makes them precess around its magnetic field so now all protons will have different frequencies according to their environment ...
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2 votes
1 answer
167 views

Is there any device/technology based on QFT in curved space?

General relativity has given us the GPS, and QFT has provided a big amount of useful technology, from medical treatments to advances in condensed matter. Can QFT in curved space lead to similar ...
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  • 390
0 votes
1 answer
6k views

How quickly does a small piece of molten steel cool at room temperatures?

Say I have a $(\frac{1}{2}D)^2 \pi \times \ell = (.05)^2 \pi \times .03 \approx 0.000236 \ \text{mm}^3$ piece of molten steel freshly spewed out of a hot nozzle. Now assuming the nozzle moves away ...
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2 votes
1 answer
205 views

How does Laser Surface Authentication work?

As a mathematical graduate student I have some trouble to fully understand Laser Surface Authentication technology. According to Wikipedia: LSA analyses the naturally occurring random structure ...
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1 vote
3 answers
700 views

Two mirrors paradox revisited

If I connect a video camera to a screen, so that whatever is seen by my camera appears on the screen, what do I see when I point it towards the screen itself? Is it, in terms of optics, this ...
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  • 1,625
-4 votes
3 answers
3k views

Do mobile phones produce radiation harmful to humans? [closed]

What are the health effects of mobile phone radiation (if any)? Does using a mobile phone without an SIM card change the answer?
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1 vote
1 answer
420 views

Martian space elevator from the vulcano Olympus Mon to the moon Phobos?

In my fascinating imagination, I am seeing a space elevator from the vulcano Olympus Mon to the moon Phobos. Phobos also seems to keep spaceships - while a smaller shuttle attaches itself to the ...
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0 votes
2 answers
80 views

why precise accelerometer do not exist

When i read about how the concept works, it looks pretty solid. But in reality accelerometers are just so imprecise that they need to be configured with alternative ways to correct their positions. I ...
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0 votes
0 answers
70 views

Will it ever be possible to observe the cosmic neutrino background?

Is there any foreseeable technology which would facilitate the direct observation of the cosmic neutrino background? Would the ability to warp spacetime have any application here?
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0 votes
1 answer
2k views

Scanning Electron Microscopy: Explanation of Numerical aperture and Extraction Field

I am trying to understand what numerical aperture and extraction field means in a scanning electron microscope. From what I understand numerical aperture is used to set the Depth of Focus which is ...
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9 votes
2 answers
3k views

Which is the "roundest man-made object": Gravity probe B rotor or the Avogadro project sphere?

The Avogadro project is part of the efforts to replace the artefact-based standard kilogram with a definition based on naturally reproducible objects. The main challenge is to make a very precise ...
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12 votes
2 answers
3k views

Can a compass be used in a submarine?

This question is motivated by several "myths" I have heard recently - I want to know if there is a problem with using a compass inside a submarine. I can see two different issues, so I'm wondering if ...
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  • 5,241
1 vote
1 answer
9k views

holographic projection in thin air? [duplicate]

from where I come from ,they taught us in high school that it is possible to project holograms in thin air simply by illuminating the hologram with the "correct light" , and having a semi ...
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  • 53
3 votes
1 answer
180 views

How are the finite speed of light and the atomic nature of mater related to the end of Moore's law?

In this article from 2007, Moore talks about the end of his Law. Can someone throw more light as to how the finite speed of light and the atomic nature of mater are related to the end of Moore's law?
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  • 795
3 votes
3 answers
7k views

Is it possible to build a mechanical version of the basic logic gates AND, OR, XOR and NOT? [closed]

Is it possible to physically build a the basic logic gates with nuts ans bolts? I'm wondering if it's possible to build a mechanical adder unit.
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  • 249
30 votes
6 answers
4k views

Canonical everyday-life example of a technology that could not work without humans mastering QM in analogy to the application of GR in GPS?

The GPS is a very handy example in explaining to a broad audience why it is useful for humanity to know the laws of general relativity. It nicely bridges the abstract theory with daily life ...
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  • 1,455
0 votes
0 answers
35 views

What are the potential technological advances that the discovery of the Higgs boson may unlock? [duplicate]

Lately I have been reading a lot about the discovery of the Higgs boson and it got me thinking, what is the potential application of this particle? I mean can the Higgs Boson change our world the way ...
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  • 189
2 votes
1 answer
244 views

What are the statuses of Silicene and Graphene for real world circuit production?

A lot of hype is out there about both of them (especially the latter) and I was wondering if there is more concrete information about them other than the news IBM posted on a circuit 2 years ago and ...
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  • 293
14 votes
3 answers
228 views

Why and how will we be able to image extraterrestrial planets in the next two decades?

According to a recently published article, a well-established Cambridge astrophysicist stated that: the “origin of life, where it exists, and whether aliens exist, is going to be crucial over the ...
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