Photons 0.0 / 5 ? PhysicsParticle physicsASAQA Created by: Mr_MackintoastCreated on: 28-02-18 17:02 Nature of Photons A photon is a particle representing a quantum of light or other electromagnetic radiation Electromagnetic waves are transverse waves that travel at the speed of light (3x10^8) λ = c/f [C= speed of light, f = frequency] E = hf [h = planck constant] E = hc/λ [Equations put together] The energy of a particle or an antiparticle is usually expressed in electron volts (eV) or mega electron volts (MeV) 1eV = 1.6x10^-19J When an electron is accelerated through a potential difference of 1v, it has an energy of 1eV 1 of 2 Laser Laser light consists of photons of the same frequency The power of the laser is the energy transferred per second by the photons For a beam of photons of frequency f: P = nhf [p = power, n = no. of photons, h = planck constant, f = frequency] 2 of 2
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