Question

Basics of photons and waves energy , radiation and frequency.

Answer 1

Photons-

A photon is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light.Photons are always in motion and, in a vacuum, travel at a constant speed to all observers of 2.998 x 108 m/s. This is commonly referred to as the speed of light, denoted by the letter c. As per Einstein’s light quantum theory, photons have energy equal to their oscillation frequency times Planck’s constant. Einstein proved that light is a flow of photons, the energy of these photons is the height of their oscillation frequency, and the intensity of the light corresponds to the number of photons. Essentially, he explained how a stream of photons can act both as a wave and particle.

Wave Energy- half the energy in an electromagnetic wave is carried by the electric field, and the other half is carried by the magnetic field.As an electromagnetic field propagates it transports energy.

Radiation-

Radiationis the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes: electromagnetic radiation, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (γ)

Frequency- the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.

Frequency = 1/time period