em waves

electromagnetic waves

vibrations between electric & magnetic fields

types of waves

radio waves, microwaves, infrared waves, visible light, ultraviolet rays, x-rays, gamma rays

em are also called

em waves, em radiation

em waves are transverse waves

1st property

em waves are created by oscillation charged particle

2nd property

oscillation

back & forth motion of an object between 2 points

crest

highest point of a wave

wavelength

distance between 2 consecutive waves

amplitude

height of a wave from the equilibrium

trough

lowest point of a wave

amplitude

maximum displacement from the rest

frequency

number of complete waves from a given point in one second

rest position

undisturbed central line of a wave

em spectrum

continuum of em waves according to wavelength & frequency

they do not require a medium, the travel at a vacuum speed of 3×10^8 m/s

3rd property

mechanical wave

transfer of energy through a medium

em waves change depending on the medium they’re passing through

4th property

Wiliam Gilbert

discovered that earth is magnetic

wiliam gilbert

theorized that electricity & magnetism are not the same

unit for magnetic potential

Gb

1603

year of wiliam gilber

charles-augustin de coulomb

made the coulomb theory

coulomb theory

theory that is defined by the electrostatic force of attraction & repulsion

unit for charge

C

1785

year of charles-augustin de coulomb

hans christian ørsted

discovered that electricity can produce magnetism

unit for magnetic intensity

O

joseph henry, michael faraday

discovered electromagnetic induction

electromagnetic induction

the production of electric current across a conductor moving through a magnetic field.

unit for inductance

H

1831

year of henry & faraday

wilhelm eduard weber

discovered the ratio of electrostatic to electromagnetic is equal to the speed of light

1856

year of weber

unit for magnetic flux

Wb

james clerk maxwell

how electric charges & currents can be source of electric & magnetic field

james clerk maxwell

formlated four equations, summarizes the relationship of electricity & magnetism

heinrich hertz

discovered the existence of radio waves

unit for frequency

Hz

1887

year of hertz

albert einstein

made the concepr of photoelectric effect

1905

year pf albert