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Particles (small size i.e. size of about 10-10m or less) which form an element or compound i.e. "Atoms" or "Molecules" are reffered to as "Elementary Particles".
Basically the term is referred to those small particles which which can't be seen with naked eyes or in Visible Wavelength of light*. ( hence viewed by using electron microscope and oil film method etc.)
What else can I help you with?
How can particles be without mass?
All particles that move slower than the speed of light have a "rest mass" or "invariant mass" - and that means, almost all particles. One of the few particles that does NOT have a rest mass is the photon, since it moves at the speed of light. It does have energy, and therefore (by mass-energy equivalence) it also has mass, but this is not "rest mass" and is often not counted as mass.
What has mass but no volume?
Light has mass but no volume. Although light particles called photons have energy and momentum which contribute to their mass, they are considered massless particles because they have zero rest mass and do not occupy physical space.
What types of radiation particles have no weight?
Gamma rays are the only ones. Alpha particles are helium nuclei, and Beta particles are electrons or positrons, all of these have mass.
Can a sub atomic particle have no mass?
Yes. Neither photons nor gluons have a rest mass. Assuming gravitons exist, they would also be massless. The only gauge particles that we know of that have mass are the W and Z bosons, which are the gauge particles for the weak force. (it's possible that "dark energy" is a fifth force with its own gauge particles; if so, these gauge particles could be either massless or not).The mass of neutrinos is so small that for a long time it wasn't known whether they were massless or not. (The observation of neutrino oscillation tells us that they do have mass; we still don't know exactly what their masses are, we just know it can't be precisely zero.)All subatomic particles, even photons and gluons, have a ''relativistic'' mass, however. This is their energy expressed as a mass-equivalent (according to E = mc2).
What are massless particles traveling the speed of light?
Massless particles traveling at the speed of light include photons, the particles of light. They have no rest mass and always move at the speed of light in a vacuum according to the theory of special relativity.
How can particles exist without mass?
People are sometimes confused by the assertion that photons, neutrinos, or other particles have a rest mass of zero. These particles are never at rest, so their rest mass is a purely theoretical concept. All particles have mass, there are no exceptions. It can be a very small amount of mass, as is the case for a photon, but there is some mass. A photon can also be described as being composed of energy, but remember that there is a mass-energy equivalence, as described by Einstein's famous equation, e=mc2. If a particle has energy, it therefore also has some amount of mass.
What type of mass is light?
Light 'particles' (photons) have no rest mass.
How can particles be without mass?
All particles that move slower than the speed of light have a "rest mass" or "invariant mass" - and that means, almost all particles. One of the few particles that does NOT have a rest mass is the photon, since it moves at the speed of light. It does have energy, and therefore (by mass-energy equivalence) it also has mass, but this is not "rest mass" and is often not counted as mass.
How many members are in the photon family?
The photon family consists of one member, which is the photon itself. Photons are elementary particles that carry the electromagnetic force and have zero rest mass.
How big is a Neutrino?
A neutrino is an elementary particle and is considered to be nearly massless. Their rest mass is still not well determined, but it is known to be very small, less than 0.12 eV. In comparison, the mass of an electron is about 511,000 eV.
How do you write gamma ray as an elementary particle?
A proton can be written as p, p+, or by its quantum numbers: 1/2(1/2)+, corresponding to spin(isospin)parity.
What term is used to define the way mass of subatomic particles is described?
Atomic Mass units
What subatomic particles have a mass of 0?
The photon. This refers to the "rest mass"; since the photon has energy, it also has an associated mass. But the "rest mass" or "invariant mass" is zero.
Does light from a flashlight have mass?
No, light does not have mass. Light is composed of particles called photons, which have no rest mass, but they do have momentum and energy.
Why the rest mass of photon is zero?
The rest mass of a photon is considered to be zero because photons are massless particles. They travel at the speed of light in a vacuum and do not possess rest mass. This is a fundamental property of photons in the Standard Model of particle physics.
How is the mass and charge of a proton best described?
Proton rest-mass . . . 1.67 x 10-27 kg Proton charge . . . . . +1 elementary charge (1.60 x 10-19 coul)
What has mass but no volume?
Light has mass but no volume. Although light particles called photons have energy and momentum which contribute to their mass, they are considered massless particles because they have zero rest mass and do not occupy physical space.
