# Sensei

Senior Members

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1. ## Photon Frequency Shift

I will explain you how to measure Doppler Effect. Imagine we have laser with well know frequency (so also energy/momentum/wavelength is known). And container with atoms which are reacting for this frequency. If we will place laser on vehicle, airplane or rocket. And laser will be pointing to container with above atoms. We can see transition. Then when we will start moving it in direction to/from container, transition will stop happening - frequency will be higher or lower than needed for transition to happen. In the case of external source of photons, such as Sun or star, we have to rely on well known absorption/emission spectral lines to calibrate Similar method was used in measurement of gravitational shift, but laser was pointing down and it was failing down.
2. ## Photon Frequency Shift

I think so he was talking about that we know nothing about photon until it's absorbed, and when it's absorbed, it's gone from the system.

5. ## Real-time faster-than-light communications question

I don't think so it's correct value. Earth can be at aphelium 152.1 mln km from Sun, and Mars can be at it's own aphelium 249.3 mln km but on reverse side of Sun. (152.1+249.3)/0.299792458 = ~1338.7 seconds = 22 minutes 18 seconds. (signal can't pass through Sun, so it's just theoretical. We would have to take into account also orbital inclination) Of course it's theoretical the worst est situation, when distance is the furthest.
6. ## RESEMBLANCE AND DIFFERENCE BETWEEN TWO ATOMS

I don't think so physics negate role of neutrino. There are scientists that are studying it f.e.Ephraim Fischbach and Jere Jenkins. Neutrino detectors are utilizing f.e. isotopes that are prone to neutrino bombardment. f.e. Chlorine changes to Argon, and Gallium to Germanium. After experiment you have to filter out original isotope from newly made to count how many reactions we had in container. This shows how hard is to detect neutrino. Read "Detection techniques" in http://en.wikipedia.org/wiki/Neutrino_detector (~500 tons of substance is not something that everybody have at home, don't you think so?) Neutron decay neutrino has fraction of energy needed for these detectors to work.
7. ## Peltier Wrist Cooler

In Peltier cooler cooling depends on current flowing through it. So you could adjust it with potentiometer and have lower/higher temperature if needed. Mine Peltier cooler tec1-04905 has max 5 A, 5.8 V = ~30 W. So it would require 8 AA batteries to use it to the maximum (4 serial to increase voltage from 1.25 V -> 5 V, 2 rows parallel to increase amperes from 2.5 A -> 5 A). Their total mass with container would be 220 grams (measured now). They will work for 2000 seconds (33 mins) or so. Device would have much more sense, if it would be built-in shoes soles. Cold plate would be taking heat from feet then to Peltier then to radiators. Nobody would know that your shoes work this way (which addresses swansont's aesthetic feeling). And there would be enough place for 16 batteries. But there is still downside- fast discharge at maximum amperage, and mass of shoes >500 grams higher (I like light weight sport shoes. Mine current one have 332 g each. Additional 220 g is 67% more (and mass of radiators is not counted)). ps. When I the first time saw initial post, without reading, I thought so it will be about generating energy from human heat to recharge electronics.
8. ## Photon Frequency Shift

Sam, imagine you have boat on water. 1) boat is at rest, and water is waving, f.e. 1 meter wavelength (distance between crests of wave). 2) boat is moving in direction of source of waves, and wavelengths will be shrinking, less than 1 m. 3) boat is moving in direction exactly opposite to source of waves, and wavelengths will be expanding, higher than 1 m. The same happens with sound waves in air. Which is easily noticeable when ambulance is approaching and receding us. That's classical Doppler Effect. Add to it constant speed of light, and you will get Relativistic Doppler Effect.
9. ## Final failure of the nuclear models of the Standard Nuclear Physics

Beryllium-8 is very unstable isotope. It's decaying to two alpha particles. Or, what is much more probable, you have no idea why they are existing. Existence of Helium-4 is doubtless. You can just ask question- why is it stable. I have calculated hypothetical Decay Energy of a few lighter elements, and every time isotope is stable Decay Energy is negative value. Proton, Deuterium, Helium-3, Helium-4 don't have any hypothetical daughter element which is conserving both energy and electric charge. When element is unstable you have Decay Energy which is higher than 0. Helium-5 has Decay Energy > 0 only for neutron emission (DE<0 for beta decay-, beta decay+ and proton emission). And that's the way this isotope is decaying.

11. ## Do photons influence the leap of an electron?

There is no single answer. For Hydrogen you can calculate energy of emitted or absorbed photon with some level of precision. You might want to read about Rydberg formula http://en.wikipedia.org/wiki/Rydberg_formula Personally, I like to use this formula E = 13.6/n^2 - 13.6/m^2 (in electron volts) n >= 1 m >= 2 so f.e. for n=1 and m=2 E=13.6/1-13.6/4 = 10.2 eV E=h*c/wavelength so wavelength = h*c/E so wavelength = 4.135667e-15*299792458/10.2 = 1.2155e-7 m = 121 nm You can put this formula in OpenOffice Spreadsheet, and you will receive something like this:
12. ## Do photons influence the leap of an electron?

I am not sure what is your knowledge, so will suggest reading about absorption and spectral lines for beginning. http://en.wikipedia.org/wiki/Spectral_line http://en.wikipedia.org/wiki/Absorption_(electromagnetic_radiation) This video should be also useful for showing different photon-electron-nucleus interactions: https://www.youtube.com/watch?v=4p47RBPiOCo
13. ## Banana a Super Food

Smash banana with fork. Then use as filling for normal (i.e. French, flat, no yeasts) pancakes. Roll them. It is superb.
14. ## [News] Frank Baker 'survives spontaneous human combustion'

It's in speculations 2nd page. And BlueSpike is author of that thread too.
15. ## If a pig had a plasma bladder could it fly?

No. Plasma is causing unpredicted chemical reactions. It's stealing electrons from surrounding it matter. It wants to go back to gaseous state of matter. There must be enough high voltage, or density & temperature, to keep plasma in plasma state. That's not plausible in living organism. I have cascade generator which is "producing" 40,000+ Volts. Once it will create electric arc, or create coronal discharges (especially), we can smell ozone O3. 3 O2 -> 2 O3 (that's example unpredicted chemical reaction. it depends on available matter what will be produced. If you would have 2 L Hydrogen, 1 L Oxygen, water would be plausible). With enough distance between electrodes (or if we will place magnets close to them) ozone can be produced in large quantity even at 11,000 V in coronal discharge (that's appearing as small violet thunders coming mostly from positive electrode. It slowly, slowly goes from one electrode to another, once they unify, there is explosion and discharge of capacitors). Above photos are from ~25 kV. You can't use plasma to keep living organisms flying in skies.
16. ## Geothermal Power

Internal heat of Earth is result of decay of radioactive isotopes that are present inside of Earth, and initial heat of forming planet. It's *finite* source of energy. There is finite quantity of radioactive isotopes, and new one meteorites are rare at this stage of formation of Solar System. At one day they will all change to stable isotopes and no longer release enough energy. Abusing geothermal power would lead to unprecedented results. You have many examples in Solar System of what happens with planets or satellites after losing all heat: Mars or Moon. Lack of energy will change metal liquid core to solid, which would result in lost of magnetic field, which would result in lost of protection against Solar storms, flares, particles with high energy. Which would lead to lost of atmosphere and sudden death of all organisms.
17. ## Could matter exist of energy?

Matter is form of energy. For instance electron/positron has energy 510999 eV. (That's ~220,000 times more than green light photon 532 nm) Proton/antiproton has 938272046 eV (1836.15 times higher than electron). Neutron/antineutron has 939565378 eV. That energy can be released during annihilation of particle. Annihilation (unlike layman think basing mostly on sci-fi movies) is not total disappearing, but changing matter to f.e. gamma photons. For instance positron with electron: e+ + e- -> y + y
18. ## Taking video and adding it to a server through wifi

Does your camera glass have wifi? What is model name? Do you have Google glass?
19. ## Why don't we make our calendar more rational and simple?

For instance - to display name of day of week currently we have to execute following code: int seconds = time(NULL); // input data const char *daynames[] = { "Mon", "Tue", "Wed", .... "Sun" }; int days = seconds / ( 60 * 60 * 24 ); printf( "Today is %s\n", daynames[ ( days + 3 ) % 7 ]; OP postulated extending quantity of days of week:
20. ## Why don't we make our calendar more rational and simple?

Sounds like more complications than it's all worth. Especially for software. Timestamp is typically stored as number of seconds since 1970.
21. ## Taking video and adding it to a server through wifi

Uploading it to FTP? Taking video - but from what source? If it's digital camera, after connecting it through USB there is appearing new removable device with it's own path. So application can monitor that path, to see whether new files appeared, then upload them to remote FTP or copy to local disk and share it in local HTTP or FTP. Mine two digital cameras are locked up when they are connected through USB to computer. And nothing can be done with them until unplugging.
22. ## ﻿Are we overpopulated?

Johnny Electriglide, do you have children? Anybody who in this thread are saying/voted that we are overpopulated- do you have children?
23. ## Compression of water

Yes. Nucleus possessing the same electric charge (f.e. positive and positive) will be repelling. Typical human made plasma wants to expand in the all directions in vacuum. Therefore we need to surround it by very strong magnets/electromagnets, which will be pushing plasma from all directions and it won't touch device's walls (that would melt it). http://fire.pppl.gov/KSTAR_First_Plasma_Photos.png Nucleus of matter and nucleus of antimatter will attract. There is even exotic human made matter where antiproton is orbiting for a while Helium-4 nucleus (so role of electron is taken by antiproton). Then after a while antiproton and nucleus are annihilating.
24. ## negative energy.

Negative energy, and negative mass, is hypothetical concept. You can read about it here http://en.wikipedia.org/wiki/Negative_mass In whole article about Casimir Effect there is no single mention about "negative energy". There is just about "zero-point energy". http://en.wikipedia.org/wiki/Casimir_effect Do you understand that you're asking about something hypothetical.. ?
25. ## negative energy.

IMHO negative energy doesn't exist. In the all calculations energy produced by fission, fusion, pair production etc. etc. we can just see positive energy.
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