What is the wavelength of a 1 Hz photon ?

[mariuslvasile]

Given that wavelength = speed of light / frequency, for a 'photon' of 1 Hz we get a wavelength of 300.000 Km. Yup, that is a 'quantum particle' right there ! The science of the very small.

Or of the very smallminded ??
Who on earth can imagine a particle being 300000 km long?

Oh no, its the great genius Einstein. Yes, that guy again ! (as his german fangirl would say in her relative punchline)


There's a reason why this guy again was kicked out of highschool.
Because he was brainfarting in the classroom again and again.
Not only he could not understand basic physics, like say refraction, but the sheer amount of brainfarts that he was releasing in curved spacetime was incompatible even with kindergarden level curriculum. In other words, he was 'special'. So he was sent to a special institution, where he formulated his special theory of relativity. Which was immediatelly approved by the special scientific community, because it made perfect non-sense.

[crawler]

Given that wavelength = speed of light / frequency, for a 'photon' of 1 Hz we get a wavelength of 300.000 Km. Yup, that is a 'quantum particle' right there ! The science of the very small.

Or of the very smallminded ??
Who on earth can imagine a particle being 300000 km long?

Oh no, its the great genius Einstein. Yes, that guy again ! (as his german fangirl would say in her relative punchline)


There's a reason why this guy again was kicked out of highschool.
Because he was brainfarting in the classroom again and again.
Not only he could not understand basic physics, like say refraction, but the sheer amount of brainfarts that he was releasing in curved spacetime was incompatible even with kindergarden level curriculum. In other words, he was 'special'. So he was sent to a special institution, where he formulated his special theory of relativity. Which was immediatelly approved by the special scientific community, because it made perfect non-sense.

A reminder re my take on this stuff.
EM radiation (radio radar etc) is not photons.
Photons are not em radiation.
Photons have a pseudo-wave character. Which is natural.
EM radiation has a non-natural wave, or pulse, ie manmade often, which can have any form.
Photons are say quasi-particles, with mass energy & a kind of momentum (i think).

[galaxy12]

Given that wavelength = speed of light / frequency, for a 'photon' of 1 Hz we get a wavelength of 300.000 Km. Yup, that is a 'quantum particle' right there ! The science of the very small.

Or of the very smallminded ??
Who on earth can imagine a particle being 300000 km long?

Oh no, its the great genius Einstein. Yes, that guy again ! (as his german fangirl would say in her relative punchline)


There's a reason why this guy again was kicked out of highschool.
Because he was brainfarting in the classroom again and again.
Not only he could not understand basic physics, like say refraction, but the sheer amount of brainfarts that he was releasing in curved spacetime was incompatible even with kindergarden level curriculum. In other words, he was 'special'. So he was sent to a special institution, where he formulated his special theory of relativity. Which was immediatelly approved by the special scientific community, because it made perfect non-sense.

Great point. I have been saying this for years. It seems ridiculous that modern scientists actually believe a particle could be 300,000 km in diameter or larger. The mainstream scientists will generally come back with a rebuttal saying the "photon" is more of a mathematical concept. If the "photon" is a mathematical concept, then why do they keep acting like it is a real thing?

[crawler]

The article from quora reckons that em pulses are light. Silly.

https://www.quora.com/What-is-the-longe ... ransmitted

What is the longest wavelength that has ever been transmitted?
Profile photo for Ron Davis Ron Davis

I take “transmitted” to mean “radiated”. As Kenzi Mudge’s answer correctly points out, one can make a basically static electric or magnetic field, and then change it as slowly as one wishes. However, there is a distinction between “near field” and “radiated” waves. The radiated field has the form of a simple, plane (or somewhat spherical), sine wave, and its intensity decreases with distance according to an inverse-square law. The near field is more complicated, according to the form of the source, and negligible beyond a quarter wavelength or so.

The longest wavelengths used for communication are those used for communication with submerged submarines. Since seawater is a pretty good conductor of electricity, electromagnetic radiation penetrates it poorly, but frequencies below 300 hertz can penetrate it hundreds of metres. 300 hertz corresponds to a wavelength of 1,000 kilometres. Even longer wavelengths are better.

For efficiency, a radiating antenna must have a length of at least a quarter wavelength, which is impracticable, but low efficiency may be achieved with a loop antenna,

At less than 300 hertz it must be much bigger than this one.

The U.S. Navy used a frequency of 76 hertz, at which 1,000 kilometres is a quarter wavelength. The effective length of their antenna was 52 kilometres. In fact, the signal was fed into the ground between two connections that far apart. Because the location, in Michigan, had low conductivity of the surface soil, the path of the current through the ground followed a spread-out, looping path deep underground, so that the path roughly approximated a spread of loops, such as the above, averaging around 52 kilometres.

At such low frequency, only pulsed transmission is possible, at a few characters per second. Further reduction of speed is necessary because of the poor signal-to-noise ratio, resulting from the very low efficiency.

My understanding is that this system has been supplanted by sonic transceivers planted on the ocean floor, joined to headquarters by undersea cables, but I have not striven to be up-to-date, since the question says “ever”.

[crawler]

Some more krapp from quora.

https://www.quora.com/What-is-the-longe ... f-a-photon


What is the longest possible wavelength of a photon?
Profile photo for Leonard Carter Former Professor of Physics at Utah Tech University (2017–2022)5y

All objects radiate depending on their surface temperature, the wavelength given by the formula WL = hc/kT, h being Planck’s constant, c the speed of light, k Boltzmann’s constant and T the absolute temperature in degrees Kelvin. Of course there’s no limit to the wavelength of a photon, it could be as long as the universe, but to consider what would be the longest that actually exists, it would have to be the wavelength of radiation from the coldest celestial body, and black holes are by far the coldest. They radiate what is called Hawking radiation at a wavelength proportional to their mass, given by WL = GM*(4pi/c)^2, where G is the gravitational constant and M the mass. For a very large black hole, say half a billion solar masses (10^42 grams), the wavelength works out to 10^11 km or 60 billion miles, about 15 times the average distance to Pluto.

[crawler]

Here are some googles.........

..................... The longest wavelength for a photon that can excite a valence electron into the conduction band across an energy gap of 0.80 eV is approximately 1550 nm.

................What is the maximum wavelength of a photon?
Therefore there is no maximum photon wavelength, q.e.d. Conversely, a photon would be blue-shifted if the observer is moving towards the source, by the same logic proving there is no minimum wavelength either. But realistically there are limits on the frequencies which can be produced or observed.2 Apr 2016


................What is the longest wavelength of emitted photon?
Conclusion 39000nm is the longest wavelength of a photon that can be emitted from a hydrogen atom in which the final state is n = 9

[crawler]

EM pulses ........... come from antennas (ie from the movement of charge)(ie from elekticity, the movement of elektons).

Light photons...... come from atoms (ie the antenna is an atom)(ie atomic elektrons become photons).

[galaxy12]

EM pulses ........... come from antennas (ie from the movement of charge)(ie from elekticity, the movement of elektons).

Light photons...... come from atoms (ie the antenna is an atom)(ie atomic elektrons become photons).

According to this nature article, light can indeed by transmitted by antennas. Light is simply another electromagnetic frequency.

https://www.nature.com/articles/nphoton.2010.237

"Optical antennas are devices that convert freely propagating optical radiation into localized energy, and vice versa. They enable the control and manipulation of optical fields at the nanometre scale, and hold promise for enhancing the performance and efficiency of photodetection, light emission and sensing. Although many of the properties and parameters of optical antennas are similar to their radiowave and microwave counterparts, they have important differences resulting from their small size and the resonant properties of metal nanostructures."

[crawler]

EM pulses ........... come from antennas (ie from the movement of charge)(ie from elekticity, the movement of elektons).

Light photons...... come from atoms (ie the antenna is an atom)(ie atomic elektrons become photons).

According to this nature article, light can indeed by transmitted by antennas. Light is simply another electromagnetic frequency.

https://www.nature.com/articles/nphoton.2010.237

"Optical antennas are devices that convert freely propagating optical radiation into localized energy, and vice versa. They enable the control and manipulation of optical fields at the nanometre scale, and hold promise for enhancing the performance and efficiency of photodetection, light emission and sensing. Although many of the properties and parameters of optical antennas are similar to their radiowave and microwave counterparts, they have important differences resulting from their small size and the resonant properties of metal nanostructures."

Interesting. Here is what wiki says. As usual their mentions of electrons etc & em radiation etc is nonsense.

Optical rectenna From Wikipedia, the free encyclopedia

Figure 1. Spectral irradiance of wavelengths in the solar spectrum. The red shaded area shows the irradiance at sea level. There is less irradiance at sea level due to absorption of light by the atmosphere.
An optical rectenna is a rectenna (rectifying antenna) that works with visible or infrared light.[1] A rectenna is a circuit containing an antenna and a diode, which turns electromagnetic waves into direct current electricity. While rectennas have long been used for radio waves or microwaves, an optical rectenna would operate the same way but with infrared or visible light, turning it into electricity.

While traditional (radio- and microwave) rectennas are fundamentally similar to optical rectennas, it is vastly more challenging in practice to make an optical rectenna. One challenge is that light has such a high frequency—hundreds of terahertz for visible light—that only a few types of specialized diodes can switch quickly enough to rectify it. Another challenge is that antennas tend to be a similar size to a wavelength, so a very tiny optical antenna requires a challenging nanotechnology fabrication process. A third challenge is that, being very small, an optical antenna typically absorbs very little power, and therefore tend to produce a tiny voltage in the diode, which leads to low diode nonlinearity and hence low efficiency. Due to these and other challenges, optical rectennas have so far been restricted to laboratory demonstrations, typically with intense focused laser light producing a tiny but measurable amount of power.

Nevertheless, it is hoped that arrays of optical rectennas could eventually be an efficient means of converting sunlight into electric power, producing solar power more efficiently than conventional solar cells. The idea was first proposed by Robert L. Bailey in 1972.[2] As of 2012, only a few optical rectenna devices have been built, demonstrating only that energy conversion is possible.[3] It is unknown if they will ever be as cost-effective or efficient as conventional photovoltaic cells.

The term nantenna (nano-antenna) is sometimes used to refer to either an optical rectenna, or an optical antenna by itself. [4] In 2008 it was reported that Idaho National Laboratories designed an optical antenna to absorb wavelengths in the range of 3–15 μm.[5] These wavelengths correspond to photon energies of 0.4 eV down to 0.08 eV. Based on antenna theory, an optical antenna can absorb any wavelength of light efficiently provided that the size of the antenna is optimized for that specific wavelength. Ideally, antennas would be used to absorb light at wavelengths between 0.4 and 1.6 μm because these wavelengths have higher energy than far-infrared (longer wavelengths) and make up about 85% of the solar radiation spectrum[6] (see Figure 1)……………………

Theory
The theory behind optical rectennas is essentially the same as for traditional (radio or microwave) antennas. Incident light on the antenna causes electrons in the antenna to move back and forth at the same frequency as the incoming light. This is caused by the oscillating electric field of the incoming electromagnetic wave. The movement of electrons is an alternating current (AC) in the antenna circuit. To convert this into direct current (DC), the AC must be rectified, which is typically done with a diode. The resulting DC current can then be used to power an external load. The resonant frequency of antennas (frequency which results in lowest impedance and thus highest efficiency) scales linearly with the physical dimensions of the antenna according to simple microwave antenna theory.[6] The wavelengths in the solar spectrum range from approximately 0.3-2.0 μm.[6] Thus, in order for a rectifying antenna to be an efficient electromagnetic collector in the solar spectrum, it needs to be on the order of hundreds of nm in size……………….


Figure 3. Image showing the skin effect at high frequencies. The dark region, at the surface, indicates electron flow where the lighter region (interior) indicates little to no electron flow.
Because of simplifications used in typical rectifying antenna theory, there are several complications that arise when discussing optical rectennas. At frequencies above infrared, almost all of the current is carried near the surface of the wire which reduces the effective cross sectional area of the wire, leading to an increase in resistance. This effect is also known as the "skin effect". From a purely device perspective, the I-V characteristics would appear to no longer be ohmic, even though Ohm's law, in its generalized vector form, is still valid.