Answer. The size of particles that can be seen by naked eye are of the order of /(10^{-3}/ mm/).

The smallest thing that we can see with a ‘light’ microscope is about 500 nanometers. A nanometer is one-billionth (that’s 1,000,000,000th) of a meter. So the smallest thing that you can see with a light microscope is about 200 times smaller than the width of a hair. Bacteria are about 1000 nanometers in size.

For inspection purposes laboratories use a viewing distance of 200–250 mm, which gives the smallest size of the object recognizable to the naked eye of ~0.058- 0.072 mm (~55-75 micrometers). The accuracy of a measurement ranges from 0.1 to 0.3 mm and depends on the experience of the observer.

As a group, the Aborigines have significantly better visual acuity than the Europeans. This was true for both monocular and binocular vision. Some Aborigines have acuities below the previous postulated threshold levels. Aborigines as a group also have the previous postulated threshold levels.

Laser beams travel at the speed of light, more than 670 million miles per hour, making them the fastest thing in the universe.

A cell is the smallest independently functioning unit of a living organism.

nothing is smaller than a photon. It has no matter. we can’t see a photon. It has no matter.

The diameter of the proton is about as much as a millimetre divided by a thousand billion (10^-15m). Physicists can not yet compare what`s larger: a quark, Higgs boson or an electron. “So we can say that an electron is lighter than a quark, but we can not say that it is smaller than quark” – concludes Prof. Wrochna.

While photons don’t have a physical diameter, and can be treated as point particles, their quantum behavior gives them a probabilistic size. Under this definition there is no absolute “size” to a photon. The cross section also depends upon the energy of the photon and things like its polarization.

Quarks are fundamental particles and cannot be split.

A quark (/kwɔːrk, kwɑːrk/) is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. Up and down quarks have the lowest masses of all quarks.

The so-called techni-quarks can be the yet unseen particles, smaller than the Higgs particle that will form a natural extension of the Standard Model which includes three generations of quarks and leptons.

Thomas Ryttov and his colleagues believe that the so-called techni-quarks can be the yet unseen particles, smaller than the Higgs particle. These particles together with the fundamental forces form the basis of the observed matter in the universe.

The media calls the Higgs boson the God particle because, according to the theory laid out by Scottish physicist Peter Higgs and others in 1964, it’s the physical proof of an invisible, universe-wide field that gave mass to all matter right after the Big Bang, forcing particles to coalesce into stars, planets, and …

The God particle or Higgs boson particle in the Dark series appears to be a throbbing mass of black tar and inner blue light until a power source, similar to Tesla coil, is used to stabilize it creating a stable wormhole or portal through which time travel can occur to any desired date breaking the 33-year cycle.

In 2012, scientists confirmed the detection of the long-sought Higgs boson, also known by its nickname the “God particle,” at the Large Hadron Collider (LHC), the most powerful particle accelerator on the planet. This is because Higgs particles attract each other at high energies.

LONDON: The elusive ‘God particle’ discovered by scientists in 2012 has the potential to destroy the universe, famed British physicist Stephen Hawking has warned. According to Hawking, 72, at very high energy levels the Higgs boson, which gives shape and size to everything that exists, could become unstable.

This little equation predicts that nothing with mass can move as fast as light, or faster. These colossal machines accelerate subatomic particles to more than 99.99% the speed of light, but as Physics Nobel laureate David Gross explains, these particles will never reach the cosmic speed limit.

In special relativity, it is impossible to accelerate an object to the speed of light, or for a massive object to move at the speed of light. However, it might be possible for an object to exist which always moves faster than light.

Albert Einstein’s special theory of relativity famously dictates that no known object can travel faster than the speed of light in vacuum, which is 299,792 km/s. Unlike objects within space–time, space–time itself can bend, expand or warp at any speed.

So will it ever be possible for us to travel at light speed? Based on our current understanding of physics and the limits of the natural world, the answer, sadly, is no. So, light-speed travel and faster-than-light travel are physical impossibilities, especially for anything with mass, such as spacecraft and humans.

Interstellar travel would be much more difficult than interplanetary spaceflight. For both crewed and uncrewed interstellar travel, considerable technological and economic challenges need to be met. Even the most optimistic views about interstellar travel see it as only being feasible decades from now.

Wormholes are shortcuts in spacetime, popular with science fiction authors and movie directors. They’ve never been seen, but according to Einstein’s general theory of relativity, they might exist.

As for backward time travel, it is possible to find solutions in general relativity that allow for it, such as a rotating black hole. Traveling to an arbitrary point in spacetime has very limited support in theoretical physics, and is usually connected only with quantum mechanics or wormholes.

The past and future do not exist and are only concepts used to describe the real, isolated, and changing present. This conventional model presents a number of difficult philosophical problems, and seems difficult to reconcile with currently accepted scientific theories such as the theory of relativity.

Travelling in time might sound like a flight of fancy, but some physicists think it might really be possible. BBC Horizon looked at some of the most promising ideas for turning this staple of science fiction into reality.

According to theoretical physicist Carlo Rovelli, time is an illusion: our naive perception of its flow doesn’t correspond to physical reality. He posits that reality is just a complex network of events onto which we project sequences of past, present and future.