# What is speed of light formula?

## What is speed of light formula?

Like all other electromagnetic waves, it obeys the equation c = fλ, where c = 3 × 108 m/s is the speed of light in vacuum, f is the frequency of the electromagnetic waves, and λ is its wavelength.

What are the 3 equations for speed?

The formula can be rearranged in three ways:

• speed = distance ÷ time.
• distance = speed × time.
• time = distance ÷ speed.

What is the velocity of photon?

Photons are the unit of light. Photons always move in the vacuum at a constant speed of 2.998×108m/s. It is considered as the speed of light and denoted by c. Einstein’s light quantum theory shows that the energy of a photon is the same as the oscillation frequency of Planck’s constant.

### How is photon energy calculated?

Energy of a photon calculator The energy of a single photon of green light of a wavelength of 520 nm has an energy of 2.38 eV . You can use the photon energy calculator to further explore the relationship between the photon energy and its frequency or wavelength.

What is the size 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.

How is the energy of a photon calculated?

The equation to calculate photon energy uses the energy wave equation and the longitudinal energy difference between two points measured as a distance (r) from the atom’s nucleus. The difference in longitudinal wave energy creates a new transverse wave (photon). An explanation is provided in the section below.

## How is a photon generated in a particle?

A photon is generated by the vibration of a particle. It is a traveling wave originating from the particle, which is constantly reflecting longitudinal waves. Now, it also has a transverse component during its vibration before the particle comes to rest.

Can a continuous EM wave be modeled as a photon?

A continuous EM wave can be modeled as photons. At low frequencies, EM waves are generally treated as time- and position-varying electric and magnetic fields with no discernible quantization. This is another example of the correspondence principle in situations involving huge numbers of photons.

How are photon energies related to the visible spectrum?

Visible Light. There are some noticeable differences in the characteristics of light between the two ends of the visible spectrum that are due to photon energies. Red light has insufficient photon energy to expose most black-and-white film, and it is thus used to illuminate darkrooms where such film is developed.