What are the 4 properties of atom?
Chemical properties
- Atomic number. The atomic number indicates the number of protons within the core of an atom.
- Atomic mass. The name indicates the mass of an atom, expressed in atomic mass units (amu).
- Electronegativity according to Pauling.
- Density.
- Melting point.
- Boiling point.
- Vanderwaals radius.
- Ionic radius.
Do photons have a size?
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.
What is the radius of a photon?
A photon is in shape like a thin stick if its energy is lower than the rest energy of an electron and like a plate if its radius is smaller than the classical radius of an electron. For a photon of hν=13.6 eV, the photon radius is 34.9 pm and is less than the Bohr radius.
Does an electron have a radius?
The classical electron radius is well known and effectively represents the charge radius which is 2.82 X 10^-15 m. The “physical” radius of the free electron has yet to be determined experimentally but is known to be less than 10^-18 m.
How do you calculate the radius of a photon?
The Schwarzschild radius (Rg) of an object of mass M is given by the following formula, in which G is the universal gravitational constant and c is the speed of light: Rg = 2GM/c2.
What is the Schwarzschild radius calculator?
The Schwarzschild radius calculator lets you obtain the gravitational acceleration on the surface of a black hole, also called the event horizon.
Can a photon orbit?
Photon orbits around a Kerr black hole Views from the side (l) and from above a pole (r). A rotating black hole has 9 radii between which light can orbit on a constant r-coordinate.
Can a photon orbit a black hole?
A photon sphere is a location where gravity is so strong that light can travel in circles. Photons orbit the black hole at the distance of the photon sphere. A photon could leave the back of your head, go once around the black hole, and be seen by your eye – you can see the back of your head.